RE: Sig midstar 40
I was surprised how easy my Midstar was to cover. The only tricky part was around the wing tips. Mine could have turned out better, but as KW Counter suggests, after 10 ft they look fine.
I built mine as a tail drager with an OS 52 four stroke. The only drastic change I made, was to build it with dual aileron servos inside hatches. I did it for the building practice. Yours will fly just fine stock - with the single servo.