Well, how many watts do the computer and associated electronics require? Search on "power calculators" for more infoHow do i know exactly how many watts (amps?) i need for the power supply?
Depends on whether you use a CPU that requires a fan or not. What kind will you use? Search on "water cooling" for info on alternative methods.Doesnt the cpu fan make a very loud sound?
No. If it did, it wouldn't be called a hobby. It would be something more like "car stereo installation". You will not be able to intstall this system properly the first time. That does NOT mean you won't be successful. It means you will buy something that doesn't work or performs differently than you planned. You'll find a different solution and try that. You'll alter the configuration to fix something you have been ignoring so far. That will break something else. You'll want to add a function that you didn't have before, etc. It's never ending.doesn't the hobby end when its completely built and all programs are installed? what will need to be maintained?
Download some front ends and the software you want to use. Try them out on the old computers. If they work satisfactorily, great! There are computers installed that have similar specs. Search on terms like "P2" or "450mhz" to see if there are posts on them.I've got some old computers at home, just sitting here... but they are quite slow... p2 450mhz?
Strictly speaking, no. But you may not like using only the touchscreen and the onscreen keyboard.Do i need a mouse and keyboard if i get a touchscreen?
Search on terms like "Double Din Slot Screen Size"what size screen would fit a double din slot?
Good luck and welcome to the "research phase" of the hobby!