Which core XY should I build? (13 replies)

I like the idea of the core XY but am confused by the variety of designs out there.
I am thinking of a 200 x 300 mm bed with a stable diamond hotend with 3 bowden extruders for colour mixing.
I will only be printing PLA but need to keep the overall design size as small as possible in the X and Y direction.
The x carriage should be strong and stable enough to handle the diamond hotend.
I will be using duet electronics with a dueX4 add on board.

I will need to do some modifications to support 3 extruders and 3 reels of filament.

So my question-----which completed and proven design would best fit my aims?

Thanks for any advice.