Skinny you are one heckuva remodelin' machine my friend!
It just occurred to me suggesting something, perhaps a bit too late though.......
Noticing your exposed wiring harnesses leading from the B-Pillar rearward---I routed mine inside existing cavities or cut and spliced them back together leaving all factory connectors in place. To me the larger bundle mounted along the top interfered with my finish paneling. I relocated it lower---in your case just below the windows.
The bundle that forms the entire rear wiring is somewhat easily fished through that channel which holds the factory rear cargo light. This same channel is also the mount for upper door latches etc. By removing all tail lights ect it was somewhat easy to move all those wires inside the channel.
Ground wires currently attached but exposed to the cargo bay were relocated inside the vertical tail light chases, both left and right sides.
The biggest challenge--if you can call it that---was splicing the larger bundle from the B-Pillar so that it could be tucked between the outer body skin and inner structures near the left tail light assembly. With a good ratcheting-type crimping tool splices were simple and secure---it was just a matter of extending each wire into the left T/L chase and then upward, reconnecting them, checking for proper operation once finished, before covering them up.
Just an idea and maybe a bit over the top but I've done it twice and not regretted it one bit; neat, clean look. Since those wires are enclosed and out of the way finishing the interior is a bit easier since you don't have to work around them.
Just an idea--------great progress. I just wonder when you have time to work or sleep!?!?!