Thanks Philip!
I primarily want it for cutting acrylic but for a start I want to play with just burning lots of little indents in acrylic, CNC would be great.
The majority of the frame and electronics I can do, or pick up reasonably cheap. Though a smaller unit may do for what I want for a start.
Light guide plate for back-lighting images is what I want to do, to purchase the plate already done is dearer than stripping out a decent quality light board (copy/tracing board, whatever they call the things).
There's an interesting write up here:
https://hackaday.com/2023/03/13/a-ha...-guide-plates/