My only input is to place the large openings if possible towards the prevailing winds in your area to help ventilate the shop in summer. If this is not possible add windows on the sides and let the breeze blow thru cross ways. Being in Florida your not going to have much of a heating issue mostly a cooling issue. Also if you can afford having an open air covered area as part of your plan works great in the summer months. A closed shop and no air here in Texas in the summer is no fun. We usually close up shop and had to the nearest lake.