mounting engine horizontal or inverted vs. vertical/upright
ULOT
It would probably be a good idea to use a thin strip of glass around the center section. In the case of the racers I had slit and lifted the foam for eight inches along the bottom spar and laid in carbon fibre tow. This was due to the expected extreme 'G' loads. For sport flying that is entirely unneccessary but a little glass in the center is cheap insurance.
Good that you reminded me about the fine thread metric wing bolts. Please don,t fail to replace them with 1/4-20 blind nuts and nylon bolts. The supplied bolts will back out every time in fact I lost a Keosho Spacewalker one time by using them and watched the wing descend by itself!
If your ship has some of the expensive machined clevis' with set screws these are also a failure waiting to happen.
If you deal with some of these problems I think you will love the airplane. Best of luck
John