Ok, time for the prep rolls!
Con, Rianna and Relle have been combing the area for suitable scrap metal to jam the door. They've found what they need- a wide girder designed to hold up parts of the mine in an emergency structural crisis. Not so large as to make it too awkward to Lift, but it should hold against the door- at least long enough to get you through.
You also have found a decent strip of metal to act as a bridge, but it is imperfect; only two at a time could get across it and there is no means of fixing it down, so it could be removed if the guards get hold of it.
Those of you working on improvising have concentrated on shields, to which you have a success. I'll ask one division- do you want large, pavisse style shields, which will be more of a hassle to move with but give extra protection if you chose not to attack in a round, or lighter shields with no such option but less weight?