I would suggest first determining the coldest environment in your location. Then figure out how many BTU's it will take to get the job done. Then split that in at least three, go to some industrial heater sites and pick out a reasonable model. Decide on gas, or electric and don't forget your circulation. And don't forget your humidifier and your exhaust fans. String the whole thing through a thermostat and bingo.
As for the shape of the house? Think about what you are growing and then imagine caring for thousands of them every day. Should they be in racks? Make a tall house. If they hang, wide and long. Maybe levels. What shape plants will be grown? Isles for walking and don't forget your sprinkler/watering system. Fertilizer. Done.
Projects usually go well with a door too. Window panels for air?
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