ORIGINAL: Homebrewer

Its a boring airplane. Here's what you can do to liven it up.

Ailerons: Replace with ones that are 50% wider.
Fuel Tank: I put 8oz tanks in mine by rebuilding the nacelles.
.40 size BB engine, note the twinstar will need to be recovered because the increased speed will tear the stick on covering off.
Remove most of the dihedral when glueing the wing together.
If you can, add 1-2 inches to each wing for extra lift, not really needed but nice.