I know there are detailed steps on replacing the drives but I couldn't seem to find anything on the other hardware (except for the buttons and display) covered in the FAQs anywhere.

What if I should ever need to replace some of the other hardware like the StrongArm and the "mainboard"? And is there even a mainboard per se? How easy will it be to replace these. If this stuff goes out, am I just out of luck and have to go with the other alternatives, Neo, Phatnoise, etc.

It appears that the remote (kenwood, I suppose), console buttons, and displays are relatively easier to come by since some of the members here are making their own custom varieties.