Installing new MB in old case

You are correct; "It is an integral part of the computer case's metal framework. It is riveted to the metal framework, 'Ribcage'. The Support Plate has 'Bumps' formed into it, that act as Standoff's, or Spacers, and keep the motherboard off of the Support Plate itself. I'm going to assume that I will probable not be able to use these bumps and will have to flatten them out and drill new holes for mounting the new MB. I also have a 1998 Gateway case that is very similar that I may use. I wasn't sure if the interior metal frame was an actual support plate or consider part of the interior case. So thank you for clarifying that for me. I'm just now starting to figure out my possible components and wanted to see if it would be possible to use an old case first. I have no problem drilling or grinding the case itself; I have the tools to do these things. Thanks again for the help and sorry about the confusion. You are correct; "It is an integral part of the computer case's metal framework. It is riveted to the metal framework, 'Ribcage'. The Support Plate has 'Bumps' formed into it, that act as Standoff's, or Spacers, and keep the motherboard off of the Support Plate itself. I'm going to assume that I will probable not be able to use these bumps and will have to flatten them out and drill new holes for mounting the new MB. I also have a 1998 Gateway case that is very similar that I may use. I wasn't sure if the interior metal frame was an actual support plate or consider part of the interior case. So thank you for clarifying that for me. I'm just now starting to figure out my possible components and wanted to see if it would be possible to use an old case first. I have no problem drilling or grinding the case itself; I have the tools to do these things. Thanks again for the help and sorry about the confusion.

I thought about that blcos, when I provided a solution for you, on how to find what motherboard will fit. My solution's premise, was designed with the fact that you were aware that a modification, or modifications, MAY be necessary to install the motherboard you had in mind. Something I do with older computers all of the time, if necessary. [Fit into the computer case itself was the premise, not necessarily fit onto the existing Support Plate. The Support Plate used is a Proprietary item from a Proprietary computer manufacturer. They want THEIR parts used in THEIR line of computers. This can be readily seen by the motherboard itself] After seeing your problem stated now, and looking back at the solution I provided you, I see my failing. I apologize, and would like to rectify the matter. To do so, may require extensive modification/s to the existing Support Plate of the Presario 5716.Or modifications to the I/O Shield, and additional use of brass Standoff's. Both will require tools, patience, and have a safety issue involved due to sharp edges. I will also need to communicate with you, through my adding comments as Clarifications, and you responding through Comments. Do you wish to proceed? (The Compaq Presario 5716 does indeed have a Support Plate. It is an integral part of the computer case's metal framework. It is riveted to the metal framework, or spot welded to the metal framework, 'Ribcage'. The Support Plate has 'Bumps' formed into it, that act as Standoff's, or Spacers, and keep the motherboard off of the Support Plate itself. This keeps the solder joints, on the bottom of the motherboard from touching the Support Plate. If they touch, two or more solder joints may have a connection created in-between them, and this would short out the motherboard. {Short Circuit. Could fry the motherboard's components, as well as the Processor, Ram Memory, Harddrive, and Graphics card, if used} The 'Bumps' also raise the motherboard away from the Support Plate, so that air can flow underneath. Helps to keep the installed hardware components cool) I thought about that blcos, when I provided a solution for you, on how to find what motherboard will fit. My solution's premise, was designed with the fact that you were aware that a modification, or modifications, MAY be necessary to install the motherboard you had in mind. Something I do with older computers all of the time, if necessary. [Fit into the computer case itself was the premise, not necessarily fit onto the existing Support Plate. The Support Plate used is a Proprietary item from a Proprietary computer manufacturer. They want THEIR parts used in THEIR line of computers. This can be readily seen by the motherboard itself] After seeing your problem stated now, and looking back at the solution I provided you, I see my failing. I apologize, and would like to rectify the matter. To do so, may require extensive modification/s to the existing Support Plate of the Presario 5716.Or modifications to the I/O Shield, and additional use of brass Standoff's. Both will require tools, patience, and have a safety issue involved due to sharp edges. I will also need to communicate with you, through my adding comments as Clarifications, and you responding through Comments. Do you wish to proceed? (The Compaq Presario 5716 does indeed have a Support Plate. It is an integral part of the computer case's metal framework. It is riveted to the metal framework, or spot welded to the metal framework, 'Ribcage'. The Support Plate has 'Bumps' formed into it, that act as Standoff's, or Spacers, and keep the motherboard off of the Support Plate itself. This keeps the solder joints, on the bottom of the motherboard from touching the Support Plate. If they touch, two or more solder joints may have a connection created in-between them, and this would short out the motherboard. {Short Circuit. Could fry the motherboard's components, as well as the Processor, Ram Memory, Harddrive, and Graphics card, if used} The 'Bumps' also raise the motherboard away from the Support Plate, so that air can flow underneath. Helps to keep the installed hardware components cool)