They're easy as.... If you don't give two fks like this
Tongue in cheek there a bit, but I know why you had trouble. You replaced the top of the sill as well as the face (maybe it was rusty too). I avoid cutting that far in if I can, makes for less headaches and the joint still looks factory.
Wagons would probably be alot more difficult to sell too. There's a few for sale around here atm including a V8 XD wagon. I see the most sought after is th XE Ghias atm, that's where the money's at imho. Manual Ghia.... just do it!!
Are the side pieces next to the grill on the FC and FD bonnet bolted on? Or part of the skin? I always wondered that.
ZJ or ZK one would work if you could mount the grill to it. On one of those the grill mounts to the radiator support instead.
Looks like one of the steel bows has spun? The steel bows as you can see in one of James' pics is what keeps the tension on the hoodlining, remove the front door seal have a look at the bows between the roof and the hoodlining, you may need to flip the front one back up into place. The hoodlining isn't glued to the roof or sound deadening at all, something you wrote made me think maybe this is the impression you have. Also you don't necessarily need another pair of hands to do hoodlining, use normal clothesline pegs to hold the material in place while you adjust it, once it's where you want it glue it into place, leave it overnight to set, re-fit trims and you're done.