Thanks Tim,
Just place your dio in front of your computer that has the background you need fullscreen and start shooting. You can easily try more backgrounds.
If you have powerpoint make a PP presentation with the pictures you want covering a whole slide (you can alter the size of the slides if you want) and start the presentation. Easiest way to show a picture full size on your screen.
As for tanks, planes etc...next on the workbench is a US Civil war dio and the Thunderbird 1 launchbay....
I'll post the results when ready since I noticed that building-blogs on subjects like mine get little or no attention.
Perhaps a 'pre 1939' forum should be added on Armorama