Finishing off the offside rear panel; the dowel is holding the roll bar diagonal in the correct position ensuring everything is level. I spent a lot of time ensuring those tabs on the corner did not overlap and butted edge to edge to give a smooth curve before locking in place with the rivet holes.
Rubber grommet & masking tape on the drill in an attempt to avoid scratching the external finishes when drilling the rivet holes:
Underside - taking care not to drill into the fuel tank, there are more rivets holes than clecos here 3x either side on each of the straight and diagonal chassis tubes (perhaps I should have fitted the rear panel before glueing it in place?) (+ must turn that nearside bottom suspension bolt around)
Finally the rear quarters where the panel locates on the side chassis rails:
The only remaining holes are for the spare wheel carrier - I marked their position from the inside with a dab of paint. I'm intending to drill the initial holes through from the inside - re mount the panel then open them up carefully with the dremel. (Again - this might have been a little easier if I hadn't fitted the fuel tank already)