I got most of the sizes of aluminium and all the steel from a local stockist. I will have to check my paper work. You can get all the aluminium sizes from the internet but some stockists have minimum lengths and then postage!
I converted all the threads to metric course standard, much easier to get all the fasteners and I had the taps already.
My build is going well all metal work and base complete gathering all the electrical and belts together now. My parts from dumpster CNC arrived today but with a customs and handling charge!!
If you needy help with the metal I can copy you my parts list for the aluminium and steel with the sizes I have used when I can find it.