with your engine choice, I would suggest an 11x5 prop instead of the standard newbie 10x6 prop. It will keep the speed of the plane down a bit, increase the torque, and slow the plane down a bit better.
I agree with the packing tape. It seems to be the best thing for small tears on "sticky-backed" covered airplanes, which I believe the Tower Trainer is.
I like the hand crank fuel pumps the best. I had an electric and it didn't last long.
I use Hobbico after run oil....I know I'm getting ripped off but it was only $2.50....I've used marvel mystery oil in the past also.
I would definitely recommend a voltmeter.

Have fun!!

Mike