Top batten slides in from the front and the 2 side battens slide in from the rear.
The main gear axle N2,P20 was not delivered expanded at the end so it did not fit on the wheel assembly. A phone call to Rainbow aircraft and 10 days later we had the main gear with the operation proper on the main axle. We decided to put the fuselage sail on but really. Not a good way to do it. Put the main gear on first as the assembly manual specifies.
