It seems that NanoDLP is the resin equivalent to Marlin or Klipper for FDM. Apparently, I can just use Marlin for motion control, as stated in this relevant subreddit. I'd need 5 if I'm having resin applicators on both sides. Alternatively, I may have to sacrifice one of them for a layer washer / UV cure light.

As for the screen, I'd like to go with monochromatic (or DLP if that's an option). Either the CanDoTheTaskApp succeeds or fails, so for me, the valid options are 13.6 inches or larger, or a cheap and small screen around 6 inches. Anything in the middle will needlessly affect the CostApp and SpaceApp while not fufilling the CanDoTheTaskApp.

The pre-sale price might not last, but at the moment it looks like the Anycubic Photon M3 Max is £656 (Listing 1, Listing 2) delivered to UK, which actually sounds pretty nice. I can also see that Anycubic is using their own slicer in the listing, suggesting that there's no need for ChiTu's software. Prometheus and SUMAOPAI also seem to be using the same screen. The reason why I like the 13.6" screen is that the X axis is almost 300mm. Pixel pitch is 46um.

The front of the Suspense will likely be orientated the same way as the aformentioned printers so that parts like the build plate can be used and without modification. 

Strongly considering moving this project to ongoing but I'm waiting to see if my initial hype will die down.