Hi Jeff,
As always, outstanding project superbly executed.
A couple of thoughts, if you could find a Con Fer porthole rack the full length of the top I think it would set it off perfectly and would be right in line with the expo look and they are very stout. Sadly Con Fer is no more so new is not likely but they did make a lot of racks from the early 60s until they closed a year or two ago. I have one but it's not the right size for your jeep.
As mentioned previously, a drawer system in the back is a great addition unless you are going to use the back seat.
Since you don't like the idea of a tent up top and are to long to sleep inside, how about a tent/cabana that attaches to the rear of the top and forms a large room out in back? you can access the rear of the jeep without going out into rain, wind or dark of night that way.
Dual batteries are a good addition for an expo rig, I'm going to get there eventually for my 8 but haven't yet.
I wouldn't mount the spare to the hood but you will need some sort of mount, the aftermarket ofers tons of options for that though and I think it makes sense to buy rather than build unless you can't find what you want premade.
Any thoughts on a similar topper for a scrambler? I know you don't have one anymore but there might be some interest.
glad to see you here Jeff! I'm looking forward to watching this develop like I do all your projects