Turns out this thread should be strictly about the gear. The main gear doors go on somewhat easily, just a bit time consuming. You can see in the pic that gear down=GOOD, Gear up=BAD. I spent a while adjusting the doors to close flush. Also, the manual suggest drilling and tapping the gear strut. I found it easier to drill through the strut and then place the screw from the inside of the strut protruding through the outside of the door and then put a lock washer and nut on. On the wire that pulls the bottom of the door open/closed, simply bend the outside of it beside the place that it slides through at the 2 main screws. The manual has you get your dremel tool out and cut away a slot to put a wheel coller, simply bending the wire works and is ALOT less time consuming. Hopefully this info will help someone on their build. Now, what engine??