I should say those levels I mined out roughly 60% of the map with a comple of caverns making the full map (not impossible, but way to tedious). Traps and crossbows seems very limited. I think I have had one combat so far (out of five or six) where a crossbow shot does more than cause bleeding. I have currently setup several civilian military squads and have them run around with leather armor as I notice standard food production stops during winter (as in strawberry/apple/wheat) and only sausage prodcution keeps rolling. I do notice the yak and alpaca population goes up during that time. I am currently working with only a single tunnel into my base (from the wild) that leads directly into the training room for my squad of mostly bronze armored weapon and board gnomes with my backup crossbow squad ready to run in and pew pew from afar. I have traps lined up along that single path, but so far not one trap has killed a gobbo.