thank you for your comments...
as for rigidity... it feels very solid... except for one thing... out of curiosity, i used a dial indicator to see if there's any flex at the middle of the X (48" axis) when the gantry is in the middle... and i think i'll have to do it again but i do see some flex... but aside from that, it's pretty solid.
i'll probably end up putting some legs in the middle...
as for precision... sorry, this is my first venture in to cncrouting and so i'm still a noob barely learning to crawl...