Off-grid hot water shower. Rocket stove powered maybe.

Dear Permies,

I am planning an Off-grid hotwater shower build and I would like to share my idea in this group to see what you folks think of it.
I hope different eyes would give me maybe a better perspective.

The general idea is building a shower shed in a remote place without any electric current, plenty of pruning available fire wood as in logs not so much.
Hence the idea using a Rocket Stove to heat the water.

I have attached a schematic drawling of the installation.
Let me share some thoughts on how I got where I am right now because I have two question marks on which I would love your opinions.

Heating up water and mixing it to the desired temperature does not appeal to me because I don't want to run the risk anyone misjudging and either have a cold shower or worst burns.
In this setup I think I can do with ordinary valves and a mixer tap, easier to come by from scrap yards.
If the system is not used for some time its easy to drain it Almost no water in the system which stands still for a long time.
(maybe I should add a drain valve underneath each vessel to completely drain the system.  

The first question mark is using either a Rocket Stove or a "regular" stove or open fire. T
he pro's in my eyes are obviously that they burn so incredible efficient and we have plenty of pruning available on sight.
The con is that it would make the whole build a bit more complicated thus time consuming and if we heat the water with open fire or a "regular" kind of stove the shower area gets heated up in the proces.

The second question mark is either to place the hot and cold water vessels up high and have gravity run the water through the shower head. Which would result in a higher shower shed and need for heavier construction on at least that part. Or after filling both vessels and heating the hotwater vessel pump air on top of both vessels to create pressure beer keg style.
The air pressure pump handle should obviously be in the shower compartiment to add pressure when needed while showering.

I'm very curious what your comments are.
Thanks in advance and have a green day or twee.

Kind regards Ifar.

I can't answer your question though I thought some of these threads might:

https://permies.com/t/45551/Emergency-Backup-Shower

https://permies.com/t/44930/rocket-bath

https://permies.com/t/131026/Portable-laundry-drying-bath-house

We have several experts on the forum so maybe one of them will answer in the rocket stove forum.