Very, very good!!
OpenBuilds OX 48x48 Aluminum
Build in 'Cartesian Style CNC' published by Giuliano M, Apr 4, 2014.
Variant on the OpenBuilds OX CNC Router, enlarged with 1500mm length beams for a cutting area of 48" x 48". Based on the original model, the larger of the two, with the addition of a third 20x60 beam on the gantry for strength. Estimated cost is around $1100, minus the router.