Looks like a project for sure!!! The good thing is you can buy practicly everything to restore and mod these things out as you know.
I picked up 2 a few weeks back...... Traded an old TREK mountain bike I had.... One is an 84 and the other is an 85. Just have to rebuild my stator and will have the engine back in 1... the other i havent even started yet.
Before:
So far:
1985 Honda ATC 250ES BIG RED
1985 Honda ATC 350X
1985 Honda FL670R Odyssey ROTAX conversion
1993 Honda Type II 200
2003 Honda TRX 90
2006 Honda TRX 90