Ill try answer a few questions for you:
They all look 78/79 except for the r/w one which has the earlier sharp angle door frames, id say it is a 75-77 model
The plate next to the body plate you photographed is the compliance plate, it wll have the month/year stamped in it.
It is either located next to the body plate, or under the battery on the r/h fender. (this plate is more important then the body plate, as you need it to register the car again)
The Blue tailgate is pre aussie spec 1973, as that seems to be the last year we got an electric motor, which it must have as it is missing the hand crank hole.
All Trans should be H41 - remember this is aussie spec stuff, H42 are rare here....
If you want, i can come have a look with you, im no expert but being a 55 nut, im sure the two of us can work it out.
Dont worry about the space, I will be able to sort that for you one way or another, dont worry about the workshop either, it might be a few months away, but will be happening regardless. in the meantime, i have permission and access to the hoists at my current employment over the weekends/afterhours if you want anything done....just let me know...
Also I have a truck that im setting up for towing, so that isnt an issue either.
Looking at the pics, this is a deal that simply cant be missed. That is a piggy gold mine.
Dave