I could see the need for brakes and wiring being a priority if the aim was a rolling restoration over several years of driving which is how I first did my 110. First priority was keeping it on the road and then larger parts were done in an adhoc manner. However looking at the photos that is not the case for this. And with what has already been stated as chassis work needed and the cost is no object view expressed above, I would be getting a galv chassis and bulkhead and starting from there. While you wait for the lead time on them you could rebuild and paint the axles so when the new chassis arrived they are ready to fit underneath it.
From op's comparisons to the 200k rebuilds I would assume as much as possible of this is going to be new replacements so if you have a new chassis and bulkhead there is an awful lot you can fit to that before you need to take any parts of the existing vehicle if everything is being replaced with new parts.
I would also echo
@v8250 points regarding proper planning. I have just rebuilt the front end of my 110 after a fire and although not a full rebuild took longer and cost more than I had originally planned. I also suffered from scope creep where I did more as it was there and easily accessible. I also worked with a digital jobs list that had big ticket items broken down into the smaller jobs required to be able to achieve. I didn't bother with cost tracking as similar to op overall cost was not a factor but budgeting to spread the cost was, and time was not an issue as I had a storage and another vehicle to use. the important part was jobs order and what needed to be done prior to enable the actual task to be completed.
E.G. the very simple task of fitting the new bulkhead (not any of the fittings/dash etc just the plain bulkhead), should be simple job, unbolt the old one, bolt the new on in its place, about 10 bolts, see the ordered job list below:
Replace bulkhead:
remove old bulkhead - complete unit
remove old bulkhead support brackets
sand old bulkhead support brackets
t-wash galv bulkhead
t-wash new galv hinges
seam seal galv bulkhead
prime galv bulkhead
prime new galv hinges
prime old bulkhead support brackets
top coat galv bulkhead x3
top coat new galv hinges x3
topcoat bulkhead support brackets x3
cavity wax galv bulkhead
fit support brackets to galv bulkhead
fit galv bulkhead to chassis and sills
fit new galv hinges
fit old door bottom
align galv bulkhead to tub
remove old door bottoms
From the above job list you can then put together a shopping list of parts, tools, fixings and consumables that are required. There is likely to be overlap between jobs and once you start the lists of required tools and consumables should reduce as you already have them.
You can also see form the above list how long there is waiting for paint dry before you can give it another coat or fit it. I was using high grade enamel so the dry time between coats was about 24h and the time from finishing to it hardening enough to be able to fit was about a week. So you needed to plan things to do in that time so there was concurrent activity excellent, thank you