ORIGINAL: carrellh
If you know for sure engine you'll be using you could buy a Hayes or Dave Brown one piece mount for it. That way you can drill your firewall and install the blind nuts before building the fuselage.
If you don't do this you MUST have the engine because once the Fuse is built up you will not be able to fit the Blind nuts for the engine mounts...
(I have a 60 sitting on the bench right now!!!)
I'm using a Super Tigre G-90 on mine...
Matt