Same size as earlier versions but with differences.
The outside measurements of the "box" are 740mm x 660mm x 1m high. I was using ABS when I first designed it so the box consists of an extruded aluminium frame with clear acrylic panels for use as a fume cabinet. Now I use only PLA and fume control is no longer an issue. The bed is a 500mm x 500mm x 5mm aluminium plate with a mains powered 1200W heater pad stuck to the underside. I expect printing volume to be 290mm x 290mm x 700mm high.
I'm planning to have the bed moving up and down for the Z axis. In one of my earlier versions I had a moving XY carriage and fixed bed but that proved impractical. The Z drive will consist of three trapezoidal threaded rods with 1mm pitch driven in unison by one stepper motor, 3 timing pulleys and timing belt. Adjusters will be provided on the nuts for rough bed levelling and fine bed levelling will be automatic using the software in the Duet 2 WiFi control electronics.