After some struggle, I have nailed down the solution. Had to enlarge the bracket hole to 5mm. It was 4.5 or something like that. The rivet is 4.8 Dia x 15mm. This is perfect for 8mm plank. The earlier rivet was unsuitable: too small and too short.
It wouldn't, the comment was it would rip out of the mdf, if the 2 x 1 wasn't used.Why would a screw rip out of a bit of 2x1 s/w timber?
yes exactly rightGluing could have been done before the the panels were riveted on. The boards felt strong enough to not need it. Only time will tell if this belief is right.
On things that are useful, I like to go bulk, for a lifetime supply. Why go to the shop, when you can get them from a box?You can never have enough duct tape.