RE: LR-1 retracts???
The LR-1 wing is pretty thin so I don't think most retracts will fit. It does have a balsa spar (maybe capped with extra fiberglass).
The plane is pretty strong as it is holding up just fine to a Sport Jett 50. The wing skins are basically balsa w fiberglass on top of it and are not very thick, so landing loads would probably need a doubler to help spread the load.
IMO, use some thin racing wheels and the drag from the gear will be minimized. The weight from the retracts in this case is probably not worth the effort or performance gain.
Check your AUW, once it gets over 4 lbs, be careful of high speed stalls.