Well, it's taken me 4 hours, hopefully the next 7 won't take as long.
It's not the way I wanted to do things but I have to work out a plan of attack that fits with my abilities and time available.
Hopefully this works. I now know why everyone uses Sketchup. At least my Sketchup and Photoshop skills are improving. Need a cup of tea before I start on the next one.