http://http://buildyourcnc.com/greenbullCNCkit.aspx
PLEASE PLEASE PLEASE don't build a machine using MDF you will regret it. . . . .I know it's tempting because it's available and cheap plus your used to working with wood Etc but it's got no place in CNC if you want a machine that's going to last more than 1 winter
and be accurate.
From a business point of view you it will inderr more than help and you'll be constantly chasing problems costing more than the time and money you saved.[/QUOTE]

Thanks for all information I may not need a book after all:tup:

To be honest I don't really have the time or even the space to build my own from scratch. I just couldn't see myself going all the way back to my workshop in the evenings to work on what could be a 6 mth or more project.
I'm thinking that my budget wouldn't stretch to buy a new machine of that size with all the software etc but that the kit would be a good option. It was actually the 'green bull' model that I had seen and on closer inspection I can see its actually made from a plywood and not mdf. I don't know if this would change your opinion but they also mention that they've strengthened the design of the gantry with ribs forming a torsion box. Is it its lack of strength or possible movement of wood with the seasons thats your main objections to these kits and if you know of another kit that doesn't use wood I'd love to know.
Thanks again
Garvan