The wheels should be placed just in front of the leading edge of the wing. Glue apiece of 1/4" Ply to the bottom of the fuse to attach the gear to. Use nylon bolts, they will break off in the event of a rough landing without alot of damage. Get the Sullivan tail wheel, it has a small spring wire that is inserted into the bottom of the rudder. Don't forget to rebalance your plane.