It's a good idea but I would keep it domestic as no one wants to deal with international shipping (unless someone international wants to implement a 2nd one for those users)
Yeah, I agree. Maybe start with North America only, then if we get enough interest from those in EMEA and/or APAC, we can launch separate demo/loaner circulation for those regions.
and I would limit it to established and active users. None of this someone new and random popping up who has no history and nothing to lose if they or the frame disappears.
I also agree. You've got to have at least some level of previously-established forum presence, perhaps also at least one or more positive Classifieds referrals under your belt, before being approved to participate.
On the flip side, I think it needs to be made crystal clear that by donating, you accept the likelihood that the frame(s) probably won't be coming back to you in the shape that it/they left in, and worst-case scenario, there may very well be some amount of full loss that occurs, as much as we never want to see that happen. In that sense, one needs to think about this more as a donation than a loan. You only give what you are perfectly willing and prepared to lose, with zero compensation, if that's what it ultimately comes to. Granted, those instances should never occur, but we all know stuff happens. We just never want it getting out of hand. On that note, I'd be just as inclined to hold off on this whole idea, if we foresee too many downsides in the long run.