What does it weigh?

If it is light, (10 pounds or so) it would be a 3D machine for sure. If it is 12+ pounds, probably not. I've seen them do all scale aerobatics, and they do them well. I've seen one TR on the old Goldberg site. I think the pilot was Dave Patrick himself. You are correct, the surfaces are well built for 3D, and the plane is bred for aerobatics.

The ST 3000 should be plenty of power. What prop are you thinking for 3D? Can it turn a 18x6W APC? I had one of those on an OS 160, and it was a stump puller for sure.

Good luck.
PS, put the CG in the trunk!