I will add my 2 cents worth. This plane is an absolute pleasure to fly but you need to do a couple of fixes up front!
1. I used an OS.91FS and did not need any add'l weight to balance.
2. The lower wing has no internal plywood spar, if you catch a wingtip you will in all likelyhood be doing a repair. It might be a good idea to beef up the lower wing.
3. solder the elevator pushrods together instead of using the plan suggested linkage.
4. The ailerons are extremely responsive and this plane will turn on a dime with 9 cents change!
5. Enjoy!!!!
Happy Flying!
LOOPMAN