I would say plan for growth now. You're putting in 30bbl tanks now, who's to say in a year or two you won't be upgrading to 100bbl? adding more fermenters? Finances allowing... At least 3-4 stories high, follow in the path of Stone, Sierra Nevada, etc and go green. Recycle byproducts, solar panels, etc. its much easier to do up front than it is to re-engineer the facility. If you don't already have a professional brewery consultant, go get one!