Do you require anything to be prepaid? If so what % of the total price?
From the looks of it those are remodelled shipping containers, am I right? Or are you building these from scratch?
The outfit is fairly sophisticated, I've seen similar projects and people rarely put air filters in there to cut the costs. Same thing with motorized opower cut offs, since these are more expensive than regular breakers. You chose to be rather on the high end of things, which makes me wonder if there will be a demand.