[Designer]

When I say ali is difficult to cut I mean due to clogging teeth of blades and clogging the grit of grinding wheels. If you intend to clean your cuts up with a hand file I recommend you buy a file card (it's like a very stiff wire brush). You can clean the clogged files up.

I would recommend hand filing any holes out to finish size (get them close with a dremel first) as aluminium cuts rather quickly and it's quite easy to make mistakes