Nick,
Your install seemed to go as smoothly as mine did. I used a new gasket and RTV (t-case side) with no leaks. If you have the auto tranny, there's a sump in the tailshaft. With the manual tranny, there is no sump. I would have suggested some type of lubricant (grease or never-seize) for the tranny output shaft. Forum member Premier had problems with rust preventing him from easily removing his old t-case.
I'd like to see your fabbed shift linkage. My t-case came with a modified BII linkage but I had to fab another t-case shift arm.
I'm running some 'junk' Mercon III in the case right now as a "flush". I'll drain it in a few weeks (if you leave your front driveshaft off and run the t-case in 4 Hi, the chain spins the fluid around).
Also, you didn't need to seal off the back side of the speedo cable. There's a rubber o-ring that seals against the case.
Lastly, buy one of those u-joint/ball joint press tools from Harbor Freight. They're pretty cheap and you can R&R all five u-joints in under an hour. If you have the double cardan front driveshaft, replacing the tandem u-joints is a real thrill............
Dave.