White's Smokeumpers were the boot of choice, generally, if you could afford them,when I was 'jumpin' nearly 20 years ago, but guys wore Hathorns and some other brands as well. They did fine, but for big game hunting, I still prefer the Danner Raptors--not cheap, but they combine attributes I can't find in any other boot and I've looked hard for alternatives. Just me.
A bit of closed cell foam to sit on is a very good idea. Finally did it last year myself. Cut a piece just big enough for my butt and then sewed on some 2" elastic that more or less goes around my hips. That way, when I get up to move a few feet, etc., it goes with me and the wind doesn't blow it away.
On the tipi style shelters--haveing made quite a few of these over the course of several years and trying several designs, I wonder how well it would work to suspend them from a tree. I've been so busy designing them with a pole in mind, I really haven't thought about the tree idea--maybe I should put some thought into that. Finding a tree with limbs that are strong enough that extend far enough from the trunk to provide a flat space on the ground to pitch an 8' to 13' diameter tent, would be difficult, I think. Many conifer trees have pretty whimpy branches, expecially at higher altitudes. Stringing a rope between trees to hang it on---by the time you do that, if you can find a spot to do it, how much weight and bulk in rope do you end up packing? And it'll be much harder to set up than just using a pole.
Edit: ...and when the trees/branches sway in the wind, so does your tent. In heavy wind, the tent could be damaged or worse. If you had a stove going with the tent moving around...I just really don't like what could happen in this situation the more I think of it. I've gone for the super lightweight before, and what I've found over the course of 25+ years including backpacking, mountaineering, smokejumping, big game hunting, etc., sometimes saving a couple of pounds isn't worth it. We can get so caught up in shaving every ounce ( I still do) that we lose sight of the fact that to hunt hard day after day, espiecially in poor conditions, you need a shelter that provides some level of comfort and reliability for you to rest up properly and dry out for the next day.
The pole I've been using is aluminum and very low bulk when packed as all the individual lengths collapse down completely into the largest diameter piece and is subsequently pretty lightweight as opposed to designs that have several alternating size lengths that end up taking quite a bit more space when packing (don't nest down into each other) and subsequently weigh more. I've checked out the carbon center pole idea and using typical resin, the melting point is too low for me to feel comfortable using them close to a stove. I've checked out the use of high temp resins for carbon poles, but the temp numbers are still a bit concerning to me and the cost for a center pole made of carbon and hi-temp resin is crazy and the small weight savings over what I do just does not pencil out. Just my findings...