Ben,
Progress looks great. Let me chime in on a couple things.
Greg mentioned to me that after studying builds for sometime, he determined that no weatherstripping is the way the builds have evolved. I originally had it all over the frame, thinking it would provide some isolation for vibration, and ended up removing it all. Hopefully a more experienced member will chime in, but I think that weather stripping is out, and just using some sealant is the way to go. Please correct me if I'm wrong.
In regards to the steering shaft, I originally had cut my shafts so that the U-Joint was adjacent to the firewall bracket. Because of the header clearance issues, I purchased another shaft (cheap!) and moved the u joint further forward to clear the header.
Also, I'm noticing quite an angle at your trans to driveshaft joint. Makes me wonder if the back of your trans is sitting up too high. IN my setup, there is almost no angle at either joint; the engine/trans slopes downward a little to the rear, and the rear axle a little upward. We have different trannies, so I can't comment on the mount you may be using.