I think it is a good idea.
I would do it like this:
-All tanks have one camo net onboard, choose the colour in hangar (green/brown (the tone will be adjusted to general colours of the map OR one with general colour which will be adjusted to colour of the surroundings (technically more difficult)).
-When you find a good spot choose the direction your gun will be facing and initialize the camo net build. During build you are not able to operate the tank for, say, three minutes. If you abort the build in emergency it will take 10 seconds for crew to get back in and you will lose the net. If you decide to repack the net it will take half of the build time to repack, if you abort the repacking in emergency you will lose the net. You do not need to have an unobstructed space since the net will build through trees, walls etc.
-Camo net will reduce the visibility quite a bit but not totally, optically, and the icon is not visible at any distance. Of course you will be visible from angle where you gun faces since there is a section of net missing. It will also reduce your SA by limiting the visibility (one option is to make a flat topped octagon and let commander have unobstructed visibility).
-Camo net will be an octagon reaching the ground all around except that there is no net on the section your gun is facing giving you some area to direct your gun without disturbing the net. If you move the gun against net there will be a sign similar to "supply" button on top of screen which will show if you are in danger of destroying the net (if you destroy the net by turning the gun you could either destroy just that section you move your gun to, or optionally destroy the whole net. Destroying the net by moving the gun would also be a good way to make more firing section but if you destroy more than 50% the net will be lost).
Just a few ideas.
-C+
