welding steel base or just getting aluminium extrusion

[m_c]

I know you are going on other designs but all this generally means is.... someone that isn't an Engineer or a fabricator came up with a design, made it and it worked, and that then sets a president others follow. That does mean mean its good design all it means is someone proved it worked. In the same breath if that design had been done by someone with a lot of experience then that would have been the president and far easier to get a lot better result.

You'll not last long in the DIY CNC world with sensical observations and comments like that ;-)



Listen to what sluppit has said.
I took one look at your design last night, and immediately wondered how many tonnes you were planning on having on it, and why it wasn't using full length sections on the long edges. It looks to me like you've just kept adding bits, without really thinking about why you would need to add them, and ended up with an over complicated design.