RE: goldberg ultimate
For the first year, I ran the supplied 2-56 elevator hardware in the rear. Never had a problem, but there was some flex on the ground. When I put that YS140 in it, I changed the elevator hardware to 4-40 which stiffened it up but had no detectable effect in the air - I don't think it's necessary.
As for other tips, don't fool around trying to attach the cabanes to the fuse from the wing opening. Cut the covering off the bottom front of the fuse and you can reach right in and get to it very easily. Then recover that compartment with anything - it's completely enclosed in the cowl. Everything else on mine is box stock and like I said - you're gonna love this bipe.