KaosDriver is right about the gear being weak on the Fun 51. When I build one I cut away the balsa outer sheeting in the area of the LG and put in plywood reinforcement.

The Fun-51 build is very easy but you do have to do a lot of carving and sanding on the leading edge of the wing. I built a countoured sanding block to help with this.

I have never built an uproar.