Last two bolts in

I managed to source the two rear bolts and installed them today.

The pair on the left are from a original Nissan bolts from a dismantler, the shiny bolts on the right are compatible near-equivalents from a local fastenings supplier - they're M10 x 40 mm with 1.25 pitch thread and 8.8 grade toughness. The Nissan originals are 10.9 toughness
 

Back up on the scissor jacks and car stands one last time. Note the block under the scissor jack is 100 mm high (screwed together). That allows the car to be raised to just over 450mm high - which is just enough the roll the battery under.

Here's the two (black) brackets with the missing bolts at the bottom. I had to remove the 4th under-body plastic panel to get at them easily. If you do this step before installing the battery you may not need to.

I filed about 7 mm x 10 mm out of the bracket.

Here it is back in place.

And all tightened up.

Both sides finished.

Body panels back in place.

All done.

This all took 2 hours, including drink stops.