I agree with Crappie … my 20 something year old son and I are not the smallest of people and the bench is fine. If it is my wife and I there is plenty of room.
In MN we can manage 3 easy holes in the house and I usually run a tip-up outside anyways.
The weight of the house (with the seat) is manageable if the snow is not too deep. If the snow is a bit much (like last year) >>> Smitty sled.
I get it that is probably too late for you at this point, but I would choose a different sled house for solo fishing. While I love bird hunting alone (well me and the dog(s)) … I find it rare to ice fish alone … and if I do it is nice enough outside that I do not need any house. If I am alone … I am running real light and probably moving about unless I find the bite.