Joes 2006 is a much better machine than the JGRO, but won't give you a full 48" of travel. Best bet would be Joes 4x4 Hybrid. It's possible to narrow it down to 24" of travel.
http://joescnc.com/
All the Joes 2006 drawings can be downloaded here.
http://www.cnczone.com/forums/showpo...&postcount=156