I, too, will use longer screws for the control horn backplates for the ailerons. Like many of the mods I do, I look at them as insurance: it probably doesn't need it, but if and when it does, I'll be very glad I paid the insurance.

I've seen several GP Spacewalkers built completely stock fly and handle very well. One has an OS 61FX, the other an OS 91 4stroke - both plenty power. However, every one I saw came out tail heavy and required quite a bit of nose weight. Many owners in these forums also have similar experience. So I figure if I have to add noseweight, it might as well be more engine.

Flyseven, I'll post more pics here as I go along. Hopefully I've finish it up in a couple of weeks.