I don't know if other people have already suggested this already but it just seems there are not enough doors int the game. Right now I am building a 10-12 level bunker and jail cell and wooden doors just don't look right ya' know. I looked online and found a few picture for you devs to look at. Also if anybody wants to see a certain door to be looked at feel free to post here. 
https://encrypted-tbn0.gstatic…6UDACNL8h81euIvtG3rbTHOFA
https://encrypted-tbn2.gstatic…Sx9VMduG2P0dawU7-xlabz8Ng
https://encrypted-tbn2.gstatic…BlCh_c0deMpiA7lqDMT-mJf1H
https://encrypted-tbn1.gstatic…MkeoL_ztgH5MBgkYez1Akcxj-
https://encrypted-tbn2.gstatic…P28INFgTWWg6zc99eE0EgySOw
