Dave,

I used the Jett CG tank but I didn't try to reshape it; just shoved it in there and bolted the wing on. It's a tight fit but that doesn't seem to cause any problems.

Q-40 tanks are usually snug and hanging a strip of tape off the end can give you something to tug on when it comes time for removal.

Most Polecats come out under weight (the finished one we bought from Bruce was 3.5 ounces under....). Add tip weight, possibly tail weight, a lane marker, and residual fuel and you should be right on! Nice thing about an underweight plane like this is that it gives a little room for repairs without getting too far away from minimum weight.

Question: did you paint the entire airframe, or just the trim?

Tony Pacini