I am working on a platform for my 10.5 that is yet to ship... something to put the anvil up 6" above the pump, and something to mount the pump to.Nahhh I'm not that fortunate! My fermenter is inside. My garage is a detached garage. Although it is insulated, its only r11 I put in for 'comfort' while working outside in hot/cold. Although my keezer is in the garage and I could use it for fermenting. But not really ideal. I do like the flat cart idea, that is awfully handy. I'm likely going to make a simple 2x4 frame with some scrap lumber I have laying around. First edition is going to be awful and end up in the burn pit eventually. BUT it will teach me what I want/need for a long term cart.
I have read here the $10 furniture dolly from harbo freight is perfect for this too. Cheap, and you easily screw or hammer nails into it.