Temp rating for under quilt for winter months and boosting its rating.

Your ideas are great. Gotta keep the wind off the hammock when it's cold and windy. An UQ protector really helps the UQ keep you warm. It hangs around your UQ and keeps the wind off of it.

The UQ is more important than the TQ.

Taking a small sit pad into the top quilt to put your feet on really helps.

Make sure the noggin has a good top on it.

On those frozen butt nights, boil water for a nalgene or two. Voila: instant heat in the hammock. Put one between your thighs, one by your abdomen or in your foot box.

You'll snooze until the cow jumps over the moon.

One problem with the hot water bottle idea is that it tends to slide down … I think I might use some cheap cord to secure it to end of the hammock so it doesn't keep sliding at night.

and packing in a sit pad is a good idea. For the first few nights I might as well pack in as much warm gear as possible just in case I need it.

I think that I won't need an UQ protector if I have doors..

I was actually thinking that it might make more sense to have a new type of tarp design which encloses the hammock entirely.

Including a floor under the hammock. This would also work well in the summer months as it will keep out insects.

I'm mostly migrating to a strategy where I wake up before sunrise and keep hiking until after sunset.

You're making it a lot harder than it needs to be. Just get a hammock sock and be done with it.