Since I eliminated the doublers from the spar extensions to use the wing tube, I needed a method to secure the wings to the fuse. F-2 and 3 are 1/8"ahead and behind the respective spars by design - decided to locate the attach points where they would be the most accessible inside the forward compartment, so about 1"forward of F-2 and F-3. Iused 1/8"extruded aluminum angle and reinforced the root end of the spars with 1/8"ply. The angles are fastened with #8 buttonheads, and the studs are 1/4-20 SCHS with locknuts. The root plate shown matches the hole patterns in the fuse - it's serving as a template now to make sure the studs are perfectly aligned with the socket, and for maintaining the centerline for the remainder of the foam build-up. If Ihad it to do over Iwould have repositioned F-2 and F-3 in the fuse and simply cut a "T" slot in the root end of the spars (that matches the profile of the cap screw) and inserted a longer cap screw in the slot, sharing the spar centerline, and epoxied it in-place. The root plate will be finished to the airfoil profile and epoxied in prior to sheeting.