Thinking about an F25A but a bit unsure about buying a home built boat. Any advice?
Depends on what you mean exactly by home built.
The F25Cs (carbon over balsa) were 'home built' in a group of 8 as I recall. Sort of an amateur production factory.
The subsequent F25As (glass but I don't recall what the coring was, I think it was also balsa) were built in a factory (Colorado Composites) started by some of those same folks.
But if considering on of these boats, a good inspection is needed. There were/are some delam/wet core issues. Not enough to scrap the boat, but repairs can be difficult or costly, so word to the wise.
The home built versions are designated F82
I agree with the reservation of buying a home built, I can't count how many times I've heard builders do something like "plans called for 8oz 45/45 but I had some 11 oz carbon laying around so I used that, carbon is stronger right?" or making structural changes at whim, or even basics like not even knowing to be concerned about contamination or amine blush, etc. Scary to think about.
BUT - there are many really great home built Farriers out there. Time and track record help establish if there were issues, and of course a good expert lookover by someone who knows the boats is important. If they really followed the plans and exercised diligence in their epoxy work, the homebuilt can be even better built than most factory boats.