what are you guys using to attach all your parts together ? mast to fuselage, mast to board, wings to fuselage ...
to the original question,
i think you'll find that the most durable assemblies attempt to have the individual componets carry the loads from piece to piece. as opposed to relying on just the fasteners to transmit all forces.
mating surfaces with large area to support and constrain parts.
-a flat plat on top of your strut.
-a mortise/tenon joint (best if tapered) like those used for tuttle boxs
- the use of dowl-pins and bushings
-use crush sleeves (bushings) in the clearance holes for threaded fasteners and washers under the screw heads to prevent damage to part from over-tightening.
-Tnuts are good. Barrel nuts are popular when you dont have the luxury of (or dont want) a thru hole
i think you are starting to see 'tuttle' style joints between mast and fuselage.
as well as 'ferrule' style fittings between the main wing and fuselage.
..wing is molded around a hollow stringer along its centerline. Attachment to fuselage is then made by sliding wing over the nose of fuselage.
i'm sure there will be many effective methods, but most try to minimise the loads actually carried by the fasteners.