The Edge 540 uses a 2 piece wing with joiners on both sided that slide thru channels in the fuse sides and join in the middle with metal bolts and wing nuts. I just finished my wing assembly this morning. It was super easy although I made a stupid error and reversed the right side wing joiners from front to back. It hasn't made a difference, no incidence or dihedral. Next step is the engine mounting procedure which will take some doing on my part. Since I have chosen a motor that does not fit the supplied mount (Saito 120S), I will have to knock out the pre-installed blind nuts and redrill for new positions. Also I will need to figure out which way the engine will be mounted (sideways or inverted). Most likely I will go inverted with a glow driver of some sort to get the proper angle of the shaft in relation to the cowl opening. Any thoughts or suggestions on this? Anyone?