With the addition of some wheels and an engine you could use it as transport between gigs. Add a toe bar and you could transport the rest of the band, and there gear !

Why not add a MP3 player, a wide screen TV, a DVD player, an armchair and a beer fridge and a whilst you are about it !

And a fallout shelter, and may be .... the kitchen sink!

Dude, the last thing you want to end up with is a turd with no resale value that you blew 5K on.

If you want to play an acoustic, play an acoustic. If you wana incorporate the sound of a trumpet into your sound, hire a trumpet player / use a midi keyboard / Roland ready strat if you must. No need to try and do everything your self in a band type environment !

Changing guitars on stage is easy and what happens if you bust a string ? You are either going to have to have the individual instruments as backups anyway or have two custom axes at twice the price.