The recessed pop out clothes bar in my Flagstaff is a workhorse for us, for clothes hanging, jackets or towels. Some people use this bar to attach their hanging closet.
I carry alot of what you listed (and other) with no problem and still extra room. It all depends how you pack and fold as well as the organizational systems/tools you decide to use to keep order inside. I've had my A-Frame since 2012 & have reorganized it several times before I found what worked for us with the stuff we carry.
That is alot of towels you want to bring along, maybe consider reducing space by substituting a few traditional towels in your count for some of the back packer towels? (They are like shammys)
Look forward to hearing what you get!
