We were fairly fortunate - this one had been a PFA project, and had flown for a few years in the UK before the owner had flown it to France. It was in bits (although mostly complete) when I was offered it (and a Lycoming O-235), but I think the cost of rebuilding it to fly would have been equal to the cost of scratch-building one (maybe two) Isaacs Spits!!
I'd spoken to someone at the PFA about it, and he had offered to look out the necessary paperwork on it when we got it back to the UK.
However, I am looking for someone who might be able to help with the smaller replica..!!