Background images after inital set up

[scousejedi 0]

I am constructing a quite detailed model (SdKfz 234/2 Puma) and I have a few blueprints that I am using quite successfully.

Now, due to my lack of skill modelling its taking some time and I cannot get the whole thing down in one sitting.

When I reload my p3d the background images have disappeared.

Now, I have enough detail down to be able to change the size of the image to suit but it takes a lot of time and messing around to get it just right.

So....

1. Can the positions and size of the background image be saved?

2. Can the actual size of the background image be set somewhere in pixels?

3. Does SURFACES -> Set background texture T really do anything. So far I have seen no effects of its use.

Thanks