I did a similar job last weekend, though two batteries. Yes, the earth stud is a PITA [bawl]
Can anyone see any significant issues with that I've done,
I would like to see more clearance between the battery hold down clamp and the positive post.
I cut back a little of the grey plastic lip at the bottom of the battery on the side near the corner bottom right in photo 4.
It allows the battery to sit a little further away from the ABS.
I also slightly loosened the ABS pipe nuts and rotated them a few degrees away from the battery clamp. Finally I put a plastic cover on the pipe nearest the battery.
cheers
Peter