Some really interesting projects going on there, that must have been a good tour. I'm not entirely sure how keen I would be on a 500 in such good shape having a Subaru engine, somehow feel that it should have had a more modern FIAT engine, but that's just me.
I do however really like the idea of a "kit car" (I use the term advisedly) with a powerful, small engine such as a Superbike unit or a 1.4 Multiair.
That Hillman Dimp reminded me of some that used to take part in "Super Saloon" racing in the '70s. One used to run with a Cosworth BDG Formula 2 engine and the other had a DFV under the, er, well, roof I suppose you could say