I put the tank back on yesterday. It took about 30 minutes to put the tank back in place and bolt it up, and then an hour fighting with the pipework to the filler neck
Back in the way it came out - lower the car on to it, being careful not to trap anything in the process. Note how close the fuel filter is to the arm of the lift - its equally tight on the brackets for the under-trays so I shall remove this next time.
The vent pipes can be put through the hole in the chassis leg when the tank is still 6-8" down from final position. Lifting them up to meet the hole saves bending them horizontally.
Reattached. The pipe clips are NLA and a bit of a mess so I've used jubilee-type clamps in this pic, but they are too bulky. I'll need to recover the originals I think, and research an aftermarket solution for future projects.
The dual hose clamp here is also NLA as it's D2-only. Tbh I don't see any reason to attach the two clamps to each other - that only makes it harder to assemble. They're stock sizes though so easy to replace with single clamps.
Subframe next