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That is an *extremely* tall order. I am skeptical it can be done. You will need at least 4 sq ft per chicken indoors to keep them from going *completely* batty (and in Minnesota winters, it'd really be a lot safer to have a lot more room for them)... and so you're talking at least 6x8 for the house part *alone*. The weight of materials needed to make it rigid enough to survive moving, and predatorproof, adds up extremely fast. Plus then you need something on the order of a 10x12 'run' portion.
Frankly I'd suggest rethinking your plans and just building a fixed coop. You won't be moving a tractor for 5+ months of the year *anyhow*, so it is not as much difference as you might think. If you wanted to make a tractor to use just in the warmest part of the summer, that is more doable.
If you are really intent on building a seriously-winterizeable 12-chicken tractor, and again I am not convinced this is quite possible, I'd suggest thinking in terms of two separate parts (a moveable house part, and a pen part) that dock securely together when you get to where you're going. However, realize that it will be so obnoxious to move that you are likely to have the ground get very badly thrashed under it before you move it... (for reference, just 2 hens in a 4x7-footprint tractor make a very noticeable impact on my own lawn in 1 day, and reduce it to mostly dirt in 4-5 days)
Good luck,
Pat
