Don't know how costs are there but here in northern Michigan we built a 60X54, 3 bays plus 4th RV bay, 4" concrete except RV bay which has 6", 10' ceilings in 3 bays, 16' in RV bay, 2 man doors, 2 windows, power door openers on all. Went with 16' with 14' door so that we could have ceiling height to work on roof of motorhome. 60X20' concrete apron in front of barn. Steel pole barn building style with 2" insulation in walls and ceiling. All permits and fees. $71k no permanent electric yet. Maybe overkill but it is the first time I have been able to house all my toys and junk inside and I love very bit of it. I took my builder's advise and figured the size of everything I intended to put in it and added 10% to the size. Good advice. Yes you could use funds in a lot of other ways but there is a great pleasure in being able to wash/wax coach while it is cold and stormy outside. Sounds like you have a pretty fair quote but get several. We got 6! It gave us the opportunity to meet a variety of builders and see if we clicked. Sort of like a marriage. We chose ours, not the cheapest, based on his willingness to come out on a Sunday morning, have coffee with us and discuss our dream barn for over 2 hours. The end result is a great barn plus a new good friend. It means a lot to us.