How are you planning on attaching everything together?
I'm still deciding that, but currently thinking of a mix of alan key bolts with Nylok nuts to stop them vibrating off, and stick to rivets anywhere I can as a solid fixing (mostly) unaffected by vibration, but as rivets need to drilled out if I need to remove them I will at first also use self threading bolts until I'm satisfied with the design.
I'm still deciding that, but currently thinking of a mix of alan key bolts with Nylok nuts to stop them vibrating off, and stick to rivets anywhere I can as a solid fixing (mostly) unaffected by vibration, but as rivets need to drilled out if I need to remove them I will at first also use self threading bolts until I'm satisfied with the design.