I'm getting to the point with my module where it's soon time to place structures. Since the module will be transported on a regular basis, I thought it would be best to attach them in a permanent fashion instead of carting multiple boxes of things around and having to place them every time I set up. The question now becomes just how to attach them to the layout firmly, yet still with some allowance that they could be removed in the future without destroying them. If it helps, everything I'm using is styrene or resin based (N scale), no fragile wood kits.