View tower
This tower would have little or no effect on gameplay. It would be a small, light-tower-like structure that would be incredibly cheap, and its function would be to add a cooler POV. The camera would normally be straight down probably, but you can set it so that the camera is inside this tower, so you can look around using the mouse. There would be a small reticle in the center, so you could select vehicles and tell them to move still, just from a different POV. Imagine being able to overlook your colony from a high cliff nearby and watch a battle unfold. It would affect gameplay little if at all, and would just plain look kewl.