What is the actual set up time for a hub style shelter on the ice? I'm looking at the Glen's 3 person, but I'm not sure about theset up. I've used the flip over, pop up suitcase, and the fold down sled type but never the hub style. How easy is it to set up and break down? Is it easy to get back in it's carrier? My other concern is the lack of a floor. Does this make a big difference as far as heat retention with a heater? Would i have to bring something to put down under my feet. Okay last question. Would a portable buddy heater sufficiently heat this type/size shanty? It would probably serve mostly as a warming house, so this is a big one.