Late to the show, but all caught-up on the Willys project. I echo many other comments: Like your approach, comments, illustrations, pace, and video work (e.g., the shock test. Now THAT's a live axle!). And the '52 is a fantastic specimen for restoration. Looking out for episode 6...
The Spicer 18 t-case will always leak. No need to pull the drain plug. Just put more in on top. You may want to find a taper roller bearing up grade for the center shaft. Makes it much quieter at speed. And they dont wear out as fast as the stock needle bearings.
Mustie uses a mix of kerosene and bar and chain oil to coat the underside for rust protection. Then drives on a dirt road so the dust sticks to the oil.
There’s a reason for the left hand thread. If things weren’t difficult enough, you can break a stud or better have some yahoo damage a rim with a grinder cutting the nuts off.