Mendel 90 remix

First, I wanted to have a solid 3d printer for as cheap as possible. So I choose the model mendel 90 because there is not that much printed parts and the body is made of mdf and I'm used to work with it.
So looking at the plans and "vitamins" I realized it was going to be hard to make it for cheap: as I am in Canada (Québec, sorry for my English!) It was hard to find metric stuff. So I decided to work on plans to make it with imperial stuff for rods, bolts, nuts. etc.
Before I get started, I