Looks like the project is moving along very well. I have done 5 re-shells in the past, not too hard, just takes time
Couple of suggestions
1 Get a heap of sandwich clip lock bags so when you remove a item, say the side skirts, you place all the bolts and clips taht are needed in the bag. It is quick and easy pulling a car part, but it takes 3-4 times longer to put it back together.
2. Have you decided how you are going the the clutch master cylinder setup in the new car? the autech has a vac assited master like GTR's and you need to recess them into the firewall. Or like most of us that have done manual conversions, we have used a standard master cylinder from a r34 GT and you jsut need to drill 3 holes and mount it. This may cause another problem with the clutch pedal and bracket mounting. You may need to buy a standard series 2 stagea manual bracket and pedal etc.
3. To mount the handbrake you will need to bolt it to the floor. You can either remove the bracket from the autech tunnel, but that might not suit who is buying the shell. You can buy a new bracket from nissan
I think most of the part number are in the manaul conversion threads. Also they have to come from Japan, so it will take 2-3 weeks which might upset your schedule.