Here are the mods i did/finishing on my four star 60...

1. cowl out of balsa (have instructions from magazine)
2. sheet leading edge of wings to first spar.
3. reinforce the landing gear plate with plywood
4. made custom removable fuel tank floor (many people here loved my technique, have pictures to show if needed)
5. increased fuel tank from 12oz to 14oz
6. sheet turtledeck
7. put axle with wheel collars on front gear instead of those cheap screws.
8. sheet sides of fuselage to give a rounded look on the fuse (looks like an extra 300 instead of the square box as stock)
9. cut canopy, to have a more aerodynamic look to it

here are some things people do also:

10. increase stab and rudder surfaces
11. clip one wing bay
12. change rear gear to a sullivan
13. change front gear to a more sturdy one
14. round wing tips

have fun building! this is a great kit o bash.

-eugn