I managed to modify and install a Bantam 2, three zone unit in 2511. on this unit the dash and defrost vents all exit on the top side, which was fairly easy to modify for the defrost zone but the dash zone was more difficult. Not easy.
I am quite sure I had the dashboard removed and replaced well over 100 times checking space available and what approach would work best.
I fabricated my own brackets to mount the unit to the chassis.
here are just a few photographs.
Here is a link to a photo album with more photographs. This is not a project for the timid. Some of the photos have captions, swipe up on the photo if they do not initially display.
https://www.icloud.com/sharedalbum/#B0kJtdOXmGme5AJ
as for the Bluetooth controls I decided that was definitely not the way to go. There was not an option to allow dual control, dash control and Bluetooth. Bluetooth controls certainly sounded new and flashy but I didn’t think I wanted to have to always open a smart phone app to change fan speed or temperature YMMV
I modified my entire center console, relocating switches and providing space for the three potentiometers needed to control fan, zones and temperature
Larry