I think Chapman and Kimberly test drove Proto 2?
Proto 1 was made by I think Kar Kraft in Detroit, and Proto 2 was made a year or so after by Design Caucus? Not got my files to hand on that to check, could have the names reversed. Proto 1 was the Citroen engine one that's for sale, Proto 2 was an identical Bill Collins style car, but this one had the PRV-V6 in it. For whatever reason the build on Proto 2 was a bodge job - Collins referred to it as "not a good day" when it was done. That's the one that the Lotus guys are said to have tested and left Collins red-faced when it broke down. The early dealer sales agreement features lots of Proto 1 driving around but the video mentions - and shows - a PRV engine so P1 did the publicity work and P2 was an actual development car from what I can tell. There's a thing I think in Fallon's book where they mention the huge cost of having to make *another* faux-ERM underbody mould to fit the PRV as the previous Citroen one was no use. P1 has wing mirrors, P2 doesn't - with that in mind it's interesting how little P2 shows up anywhere visibly in company archives/photos. As said above, they were fibreglass underbodies with bolted on subframes - they couldn't get ERM to work at that point but were expecting to develop it. I can't quite remember whether DMC were claiming it was an ERM body actually in the car or whether they "planned" to start using it.
Proto 2 was shipped to Lotus with its silver painted interior, where it became known as "Doris 1A". Lotus based the first few development mules off P2/D1A before the redesign/Visioneering thing.
Prior to the Lotus development, there were 3 "cars" - Proto 1, Proto 2 (Doris 1A) and the Guigario epo-wood mockup.
Edit: here you go
From L-R - P2/D1A, P1, Wood mockup.