I'm attempting to follow the instructions here: http://developer.valvesoftware.com/wiki/TF2/Setup_Gates problem is the directory: props_gameplay/door_grate001_top.mdl isnt there! It gives me an error display on my level! I just started using HAMMER and this is really frustrating. Somebody PLEASE help! I tried searching for door, and grate in the model viewer but I couldnt find anything. I am trying to create a prop_dynamic and not a prop_static. So I'm not sure whats going wrong. I've tried running TF2 before opening Hammer and that still didnt fix my problem. Assistance would be greatly appreciated!