fhhuber hit the nail on the head again, but I've got a few things to add.

To make the LT-40 more sporty while still having the flat bottom wing, I'd enlarge the control surfaces by 25% to 33%, and I'd remove 1 rib bay from each side of the wing. You could probably get away with 2 rib bays being removed, but that might be too much, too fast for a novice. I would also have a 40 or 46 FX engine on it, or something simmilar.