As to the steel frame, its massive overkill for a first tryout machine.
I don't understand the logicinthat statement,Iriving.

I'm assuming you're stating.....build it in MDF then find out the pitfalls and gather some experience from the MDF build then apply it to a more sturdy material in the future?

Isn't that a more expensive way of looking at it than doing it in a more sturdy material from the start? I myself looked and thought about the material I was going to use first,MDF didn't even get a look in and so it was either Perspex,Aluminium or MS box section.

Perspex was not suitable so that left Ally or MS,Ally was far too expensive on a budget so MS was the deciding material for me.