hope you get everything going. hope my reply was of some help to you. I havent made a map for dfx yet but Ive done some with delta force 2 so I'm fairly positive that it all works pretty much the same. I believe the reason you didnt get the mis file and I did was that I had downloaded the tunnel run map from a different location and the author had included it then. sorry if I caused you a fruitless search!
However , your definately on the right track and shouldhave no problem converting. I'm fixing to try my first dfx map soon and am looking forward to playing one authored by you!
see y'all later!