Loops (within reason) & rolls should IMO be fine....just, with things like hard diving pullouts I wouldn't just assume there's no risk. Might even pull that off (no pun intended *LOL*) or even a few....but I wouldn't risk it with my
plane until I've done some beefing up of that point. Like, examine the supporting structure around those 2 li'l pegs at the rear. What happens back there when things are all stressed & 'flexy'? Mine pop right out when disassembling. I plan to add some hardwood doweling, with epoxied-in sections of brass tubing for the seat.
Of course, your plane is your plane, to do with as you wish.....just sayin'.
I haven't even started on repairing my 'Moa yet - I really should get on that. I've been frettin' & worrying on a new*acquisition that's got me like a kid trying to sleep on Christmas Eve. Want a peek? http://www.hobby-lobby.com/b25_apache_princess.htm
(*promised; long story)