Good questions.
Nick Mutton, one of the authors of THE COMPLETE CARPET PYTHON uses Pro-Line cages which are made by Ed Lilley at Constrictors NW. Both of those guys use RHPs. I also use RHPs for my snakes.
For highly/semi to completely arboreal snakes they are a good option. The snake can choose a level, ground, low perch or high perch to regulate body temps. As of late my girl will sit on top of her hide under the panel in the day. At night she will climb up higher, but usually to the opposite side of the panel.
I'm not at all familiar with tubs, so I can't say if they would work there. I think a tub would be best with tape or UTH heat.
Funny your hubby is the factor. My wife is the one who I have to run everything snake related passed. Usually it is very difficult to get my way, but I have 3 so far and VERY nice setups!
Stay the course and you will eventually get your iconic cage!