Thanks my friend!
Well, the replacement engine was finished (AMT '71 Duster), a small-block to replace the kit's big-block which apparently any smooth-hooded Satellite would never have had. HOWEVER, many problems arose:
1) Drive shaft too short for the new engine (was lengthened, see previous)
2) Once installed, found it sat 'WAY too low. Had to redo the already-redone engine mounts to raise it several mm.
3) Once totally installed, found it was still much too far back. By this time I was far more committed....I would have had to lengthen the drive shaft AGAIN, and redo all three points the engine mounted to. VERY disappointing to see the distributor almost touching the firewall. Sadly, I gave in and went with it.
Remaining wiring was connected between the engine and the engine compartment. Hopefully it looks busy enough to divert attention from the 2-3 mm the engine sits too far back. Learn from this setback, kids....
Now the rear body skirt. The kit's has two half-circle openings for the high-performance exhausts, which the actual car(s) did not have (see reference). Easier to plug a square-shaped opening in this case; so it was done with plastic, then sanded and blended to shape.
Then once installed, it was blended into the body, then primed and painted to make it look like it's all part of the body, totally connected. Couldn't do it before the chassis was installed; it wouldn't have fit and it would have been torn apart in the process (only have to make that mistake once to know).