So, the anodizaton guy (BTW great dude) called me an hour ago and said look, I have some good news and some bad news. Good news, he found the way to do it without any problems, but bad news is that it will only be ready be the middle of next week.
Now, the back story to clear out why there were problems. This front/top aluminum piece has two functions, to hold side panels, and to make the case look elegant, without visible seams and screws from outside. Problem with that is that it's very hard to hold the panel for anodization without visible marks on the outside, because everything on the outside is visible, right. But he said that he found out a way to do it, I don't know how, but he sent me these two pictures:
Also, regarding company that makes boxes, they were on some sort of trip/team building, so yeah, I just picked one day when there was nobody there. But they are close to me so I will visit them on Monday and see how the thing will go, but I heard good stuff about them (basically the problem is to find the company who will do custom dimensions for small series).
So today was much better overall, but consequences from yesterday can still be felt since there will be a bit of delay.
Cheers!