"At least they're getting of their backsides and trying to make something constructive". So are many of us. Visit our web-sites. Or if you can find one, look for an Imperial LF camera: I had several made to my design and specifications in the 1980s, in 4x5 inch, 8x10 inch and 11x14 inch.
"I just don't know much about what the actual limitations, extra costs and expertise that's needed to make the whole camera-system work together with other components." Some of us do, especially if we've worked with MF and LF camera manufacturers, quite apart from decades of experience of using MF and LF.
"For a hundred bucks I'm willing to give it a try". I've got better things to spend even $100 on -- and I already have better cameras than this, including an Alpa, so I'd be crazy to waste the money.
"Ah all the usual RFF negativity." Or "realism" as we say in English.
Don't get me wrong. I wish them the very best of luck. If anyone has $100 (and the rest) that they're willing to gamble, that's great. But with (as you put it) the "inane" film and the general vagueness, to say nothing of the general Kickstarter failure rate, a degree of healthy suspicion is well worth maintaining.
Cheers,
R.