Part way into building this and have read a couple items about beefing up the cabane area of the fuse.
I suppose just adding 1/16 ply on the inside where the bolts come through should be good, or is there something else I should think of.
Also, am i to believe that to bolt the lower wing on, the front bolt goes through a hardwood mounting block and plywood, but the rear bolt only goes through the balsa trailing edge???
That seems like a failure in the making.
I know there are a bunch of these planes out there so someone must have an idea.
I got a set of fibreglass landing gear and cowling for it as well. Power will be a pumped OS 12FS.

Any helpful comments would be greatly appreciated.

Thanks to Minnflyer for the drawing on aileron servos.
Helped out alot.

I didnt strenghten the Cabane area, but wish I had done. It held up OK, but I was always concerned about it. The problem was that the bolts sunk quite alot into the lightply. I would have though that 1/16 would prevent this so would go for it.

You are right about the back wing bolt. I didn't like this either, so I used one of the smaller lightply cut outs from the fuz to make a plate which I glued to the under side of the wing before drilling through.

I had a YS 120 in mine. Watch out for the weight and balance. I made a hatch under the cockpit and put the radio gear in there to help balance the engine. I made the hatch from the lightply cut out for that part of the fuz, just sanded it down a bit so that it would fit easily. Still had to put two oz at the back, and that was with the rudder servo out back as well.

Pick up a copy of Harry Higleys' book "BIPES". You should be able to find it at your local hobby store. The book features the Goldberg Ultimate for a large part of the building process. Included is a modification for the cabane mount areas. Costs around 12-$15.00.

There's lots of other information in there that will help you build your bipe correctly, and that can be used on other types of planes.

You won't be dissapointed.

I have built three Ultimate's one for myself two for other people. The first one was built years ago when the kit was released. they build straight as SPrink has commented.
Silversufers suggestion is also a good one.
There is one area on the Ultimate that I found wanting in strength thats the area where the lower wing fits into the fuse, Depending on what size powerplant you use I have seen the fuse liteply crack in this area on a hard landing. Before I completed mine I used some aircraft grade 1/32 ply strips and reinforced the inside of the liteply wood in that area to take more stress. this is not a big fix but it sure let me breath better on less then perfect touch downs on a rough surface.