Facilities dont appear in combat sims

[Shadowstar]

So I've added some new facilities and whipped up brand new models for them. Now I want to see what they look like in the game so I start up a ground combat, add the facilities to the planet, and start but they don't appear. Thinking that there's something wrong with my model, I decide to test it with the stock facilities just to be sure, and they don't appear either! But the facilities DO show up when the planet is actually attacked. Unfortunately, this makes previewing my models in-game very difficult.

First, is this a known issue, and second, is there a better way?