Just finished building mine a few weeks ago. So far, here are some changes I would have made:

1) The gas tank is a bugger to get in and out and it's not on the C/G. I can always tell when I'm starting to run out of gas because I get tail heavy! You might want to move the tank back a little closer to the C/G. That way you don't need a tank hatch. You might also consider a round tank instead of the flat one they call for.
2) Consider making the Rudder and Elevator larger. Some of the folks in my club suggested incorporating the top of the vertical and the outside edges of the horizontal stabilizers into the rudder and elevator surfaces.
3) I used the stock pushrods and they turned out ok.
4) I added the on/off and charging combo switch to the plane where the plans specified. It's a pain to get to so relocate it somewhere else.
5) The screws for the landing gear are fine. I have landed hard a couple of times and had no issues.
6) Be sure to use the red thread lock where they recommend it. It does help!
7) The supplied tail wheel assembly is strong enough, but where it’s placed makes it hard to control the plane on the ground. You either have too much rudder or not enough steering. You might consider moving it back on the rudder, but I don’t know what that will do to the integrity (strength).
8) I’m not sure I trust the “easy hinges” yet. You might consider a different type of hinge.

It took me 180+ hours to build, but was taking my time and this was my first build in 18+ years.

Good luck and have fun.