Someone could break something, but that's why we'd try to get someone who we know is excellent at what they want to do. Besides, looking at the numbers, parts will cost:
Zn-whatever case: $8
2 N64s (1 spare in case anything happens) ~ $30
Psone screen $50
Batteries and charger $60
Misc switches, buttons, solder, glue, paint, etc. $50
Overshooting some of these numbers, totals to about $200 to build. There will be shipping charges, which would really kill things a bit. Ground shipping is cheap, but I honestly have no idea how much it would be in total.
If we could gather up a few trustworthy members who happen to be good at their jobs, then we could make a paypal account which could be used to buy the parts, then send the parts to whoever will be working on them. When everyone finishes their jobs, they send their parts to Palmer or whoever could be entrusted with final assembly, and then have them ready to sell.