All I can say is if you build it build it as big as you can cause it will never be enough.
It is exciting to cut wood and I am sure yours will do better then mine. So far I have built an 8x10 shed, an out house, raised bed gardens, a club house of sorts (a pavillion over and office trailer with a bed room and deck on top a cedar chest and a head board and the above shed.
Mine don't move though. I hate the stickering and drying worst. It takes a lot of room and everytime you want a certain board you have to tear down a stack and then re stack it.
It is hard work.
I hope you have as much fun (I think it was fun?) as I have.
I just ordered 20 more blades and have a pile of logs that is going on three years of being on the ground and needs wittled on.