Great idea! CM would be much more fun with more flexible fortifications. An idea I'd like to contriubute is that only engineers could do the complicated stuff. Like normal infantry could just dig foxholes or trenches or make sandbags but engineers could build bunkers, more complicated trenches, modify houses, dig tunnels between houses (like the sewer movement thing in CMBB but no risk of casualies). And what about engineering vehicles, like the trench digging thing on the T72 Balkans on Fire website? That would be awesome.