Next I got everything together.
There were too many boards, components, speaker and cables. I wasn't sure if the case will hold up everything.
I virtually made a placement.
Then, I simpllified it and converted to sheet metal desidn and printed the unfold surfaces as templates.
I put every electronic components inside (I used paper to prevent electrical shortcuts :) ) and voila! It holds the components and I can move on polishing the case design by making fixing lugs and 3d print it finally :)
And this is the portable C64 up and running. I hope I finish the plastic part soon :)