A new service 400a service with a load analysis of 120373va or 335a demand is shown on drawings. 400a feed thru panels sections 1 2 3 electrical plus a 150a subpanel in warehouse. Sections 123 wont have too much space available only the 150a subpanel in warehouse. Customer is saying they want to add stuff here and there that sounds like it will quit a bit of load so other than breaker space avaialbility. How much load could customer add given the load analysis? not to mention breaker space.