I started my 3D background tonight...
Well, I've been thinking about it for a couple of weeks now, and I decided I might as well just go for it.
My designs going in a 48x24x18 tank. It will measure 43x22x11 with cutouts for the heater and 2 filters. I'm using 1" board and GE1 silicon.
I'm going for a sharper shale-type layered look as opposed to the smooth river-rock look. I started out thinking that I'd build the wall on these back-boards and install the whole thing, but the more I think about it, I believe I'm just going to continue using the backboards as a guide to keep it straight and just install the to rocks without the backing boards.
I think I've got a couple off design tricks up my sleeve on the design to help set it off a little. More pics to come as i get the design updated. Thoughts and constructive criticism welcome.