Rebuilding a 2003 Compaq desktop PC

So now that I have just upgraded my motherboard, CPU, and RAM in my current HP computer, I managed to dig out an old Compaq computer I have retired three years ago. The CPU in that PC is dead and the hardware is made up of grandfathered hardware, including an IDE 40 GB hard drive with Windows XP pre-installed. I'm thinking about spray painting the case and installing my HP's original i7-950 CPU, motherboard, and RAM in it along with an old AMD Radeon GPU which originally came with my HP. I could install Windows 7 on it, but that will require a new SATA hard drive. Or perhaps I could get an IDE to SATA adapter, format the old HDD, and install Linux on it. Or perhaps I could do both. I would also need a new SATA DVD drive installed. I'm also thinking about swapping the old 250w PSU with a spare Corsair CX600M that I have. Would there be any conflicts in fitting the modern hardware in that old case? I gutted out the case and sprayed it down with a water hose. I would also like to purchase and attach new Windows 7 (probably) and 1st-gen Core i7 case stickers on it while at the same time, remove the old Windows 7 and original i7 stickers from my current HP computer and replace them with Windows 8 and 4th gen Core i7 stickers. I also know that installing an OEM windows on a non-original HDD would cause performance conflicts. Should I install my HP's HDD into that computer and get a new 2 GB or greater HDD for my HP? Also, how much could I sell the rebuilt system for?
 

USAFRet

Titan
Moderator
With all those changes, you're not 'rebuilding it', but rather trying to stuff newish parts in a very old case.

And Compaq/HP/Dell cases of that era were not known for standardization.

Recycle the old Compaq, and just buy a new case for all the other stuff.