I've done this sort of thing before, so I've remembered some top tips.
Bolt on every panel loosely enough to allow movement, but tight enough to keep it still.
When all the panels are on the car, adjust the gaps using the longest panel that hasn't been removed as the datum (I used the doors).
Everything went well except putting on the LHR wing - now I've got a nice scratch on the newly painted sill
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Jobs to do:
1) tighten all the panel bolts,
2) test the electrics,
3) prime the engine with oil,
4) start engine and bring coolant to correct level (I did some work on the cooling system over the winter),
5) refit the wheel arch liners and undertray,
6) test drive and shakedown.