If you have 1.3 acres, go metal and go bigger one can never have enough workshop/storage space. I have a 50' x 100' metal insulated hangar/workshop/garage and I wish it was bigger. Without airplanes to contend with, I would probably be somewhat happy with 30' x 50' or 40' x 60'. Spend the money to get up a big structure and as time money permits, you can add interior panels, insulation, windows, doors, partitions, rooms etc.
I have multi room independant heat, AC, running water, bathroom with shower office, a loft, an attic, internal seperating garage doors, paint booth etc that could all have been added over time.
