It works perfectly, I played for over an hour straight without any crashing. I could only find a couple really minor issues that don't affect gameplay at all. The DC FEMS engine has no lights or siren, and it doesn't appear that it has any hose connections. The lights on two of the Pierce engines look like they're set up for the other one (see the attachment) and the MSP air ambulance's rotors don't move. This mod is really coming along fantastically, and I can't wait to see how far you can take it.