Inverted is fine. You will probably find your plane is designe for an inverted engine.... you never know.

There are some down-sides to inverted install (no pun intended...).
Setting the idle adjustment for the engine is (slightly) more tricky, and you may have problems with an overly-rich enine "dowsing" the glow plug (the glow stops glowing, the engine stops...). The right idle setting will stop this from happening.
Getting the tank installed to be the same height as the carb may be a challenge as well.

Other than that, there are no significant mechanical differences. All other differences are aesthetic and practical.

gus