The Ameristep Doghouse TSC had a zip-out floor but I found I rarely used it. I take my 6 year old son out with me and we hunt out of several blinds that do not have floors in them. We either take two small stools with us or I take one of those little insulated fanny pads which he sits on and plays cars or colors. Works fine for what we are usually faced with.

I like the blanket idea as well. It would be nice if you could find a small "blanket" made out of goretex though as it would handle the wetness issue quite nicely.