page 4 #104 B 4-5 talks about portable and permenent shelters and how to identify them and if you look thru the list of waters you will see some lakes that are limited to portable shelters
such as page 45 #341 willow creek reservoir- grand county
a. ice fishing shelters must be portable
They are only allowed on certain lakes. I don' t think they are a great idea unless you have the opportunity to move them occasionally. To much moving around involved in ice fishing for it to be terriibly effective.
i got family back in minisota and they use the farm tractor to drag a large shelter out to the same spot each year they got beds a stove gennerator for the TV/DVD they always catch tons of fish all season long
unfortunately i havent been back to visit during the ice season