MDF parts required.

[EddyCurrent]

If you must use MDF then I would suggest something thicker than 18mm, something like 25mm birch plywood would be better I think. I can see the attraction that wood is easier to work with and I must say I looked at that myself, and if you look on Youtube for example, there are wooden machines that appear to be work quite well. The first thing that strikes me is that you want these parts cut out by cnc but it seems to me they could be cut out with a bandsaw and drilled with a bench drill. It leads me to believe therefore that you have no workshop facilities because if you did aluminium is easily cut on a decent bandsaw and easily drilled on a bench drill so why not go for that instead ?