Before I even heard about the GSM, I started building a couple greenhouses. One will be fully insulated and heated, the other will be heated and cooled with Geothermal, air to air system that I'm building now. All will be powered by solar electricity. If anyone is interested I can post some pics.
I have several fruit trees growing, Mango, Lemon, Lime, Avocado. Lots of strawberries, raspberries, blueberries and of course the veggies. I also grow lots of butternut squash because its so good and lasts for a long time. I still have a couple from last summer ready to cook!
I would be interested in the pics. We are reading and planning for an expansion if we need to. The greenhouse we have is fine for season extension, but something with geothermal or a wood stove back porch type grow room might be needed at some point.