Hardware is a clone, the RetroDuo, which means can use NES and SNES Everdrives to make the system duo.
He provided this hardware and controller, plus funds for the commission.
So, initially tested with the hardware. Tried two screens, one higher resolution (which scrolled the screen so useless) and this normal lower resolution one, which is fine anyway as the consoles output low resolution - which works great.

To make sure everything fits in the case as should, i'm going to remove the boards from the Everdrives and hardwire them to the RetroDuo board such that they lay flat and also the SD cards, as best as can, are accessible.