I'd buy the snuffer from AHPC. But if I had another boat to copy from I'd source all the other spin components wherever I could get the best deal (including AHPC).

For the self-tacker though, as Mike says, find another boat to copy from (even if it's not a Taipan and with reasonable skills, a garage/workshop and basic tools it should be possible to make a copy after buying the components wherever. Bending the track is the most difficult bit and that can be done on a workbench using a piece of 2x4 cut to a slightly tighter radius than required plus some soft jawed carpenter's clamps.

Overall it could save you several hundred.