I have a tiger 60. It built pretty fast, and didn't really need alot of modification. I read here on RCu to add some extra strength to the wing hold downs, so I did. I don't care much for shaping and carving so I capped off the wing tips with 3/32 balsa. I built it as absolutely as light as I could, and ended up with a great flying plane. I think if you're doing aerobatics with a trainer you will easily transition into aerobatics with the Tiger. No it doens't really do 3d, but loops can big big especially with a 91 4 stroker, and can be tight and small with full throw on the elevator. Rolls can be pretty darn fast and little tendencies to dive. It will knife edge the length of the runway, however hammerheads need some power to get it thru the manuever. If properly balanced you can do inverted passes fast and as low as you like with great stability. I personally think that a TIGER can take anyone that is good with a trainer well into aerobatics. If I had to Modify anything, I would again brace up those wihg hold downs, and maybe increase the control surfaces on the rudder (only to improve hammerheads) and the elevator. I wouldn't bother with thhe pull pull on the elevator, or even splitting the elevator. I think you'd be surprised by it's fast and slow performance right out of the box. Slows and lands like a trainer as well.