Requirements . Required: Wire SVN, Weight Stool, Jinto's Physics Mod Optional: PHX, TF2 Construction . Step 1: Spawn a large iron beam (I used one from TF2 (Make it weigh 5500)) then spawn 2 of the largest blast door. Step 2: Place 2 large wheels on either side of the beam and freeze them in place and weld them to the ground Then "Easy Weld" the blast door onto the top of the beam.