I suppose it depends on what you want from the removable wings. Of my three most recent sub 48 inch wing airplanes, two only ever had the wings removed for maintenance. The third had wings held on by rubber bands and so those got taken off at the end of every flying session. This may just be personal preference on may part as I have the luxury of a pickup with a camper shell and can just put the planes in the back. Three immediate reasons come to mind for removable wings. Shipping, as in arfs, is a factor for mfgs. Convenience in getting to and from the field. If you are driving a Miata every little bit helps. Maintenance is the third thing. Many conventional airplanes remove the wing for access to the interior of the fuselage. The XP-67 with its blended fuselage probably just needs a hatch. At this point you are more of a fiberglass expert than I. My own personal preference would be to build the wings separately and than permanently attach them to the fuselage. The cool thing about this is; it's your experiment. You have the plugs and molds. With an airplane this small you can crank out a couple of prototypes to try different ideas.