Built my laser 3d about a year ago. I acquired the kit from England before they were available in the States. Powered it with a Webra .50 which proved to be adequate, but not for vertical maneuvers; would not hover. A change I would definitely make is to strengthen the elevator balances. Both blew off my plane during the maiden flight during an idle power dive with rapid pull-up. Landed with about two-thirds of the total elevator missing. Another came off again when landing in tall grass. During the second rebuild I strengthened the leading edge of the elevator with a piece of spruce located just aft of the balsa leading edge. I also used spruce in the elevator balance which was secured to the elevator spruce in lapped "Lincoln log" fashion; worked great, no more breaks. The wing hold-down screw is some unusual size. You can avoid losing it by cutting a hole and slit into a cyno-type hinge and using that hinge as a "thin nut" to keep the hold-down screw attached to the wing. Good luck.