Does the 2X4 ft CNC model allow cutting a 2X4 ft board or what is the cutting demeninsions? Thanks

Yes, the 2'x4' CNC router (blackToe) cuts within the full 2'x4' dimensions and a tiny bit more. Link to the machine: https://www.buildyourcnc.com/item/cnc-machine-blacktoe-v4-2x4