Back of the case finished! Well, sort of. I made many mistakes while filling holes to correct size, but nevertheless I'm still happy with the end result.
And the psu hole isn't perfect, I'm thinking of redoing it if time allows it.
sorry I forgot to mention this will be still either sanded or painted. Haven't decided yet what to do, but I'm liking the bare aluminum more every day :). And nano thanks for the info, if the mesh causes noise I'll try to find something different.
I used that same mesh for my silent pc and noticed that it makes quite a noise when fans are sucking air throuhg it. Using finer mesh seemed to help with the problem.