All back together. Yay
There was a question posed elsewhere about reinstalling, and the odd comment above. So...
Rears are easy, as long as the brackets are the right way up...
For the fronts I did the following (did this alone and on the floor so tried to minimise weight while bolting)
Put the brackets back on the car - finger tight bolts...
Put the bumper on the left hand (battery) side. Again, finger tight
Support the other side (on an Amazon box) and attach the middle coach bolts, being sure to put the cover clip in place before tightening the nut underneath (I started using nyloc nuts but they were too tough to attach to the round headed coach bolts so went to spring washers)
Loosely attach the bumper to the bracket
Align
Tighten. Struggled a bit getting the far left "bracket to bumper" bolt in place due to lack of room but got there in the end.
They look goooooood!