Hello, So I want to create 2 empty boxes, one box fit in the other box with 45 mm between them. I will be using Laminated MDF 18 mm. I will also insert Rockwool Between these 2 boxes. My question is how to fix both boxes with each other and how to hide the Rockwool space from the front and the back ? ps : I will also have a door that will be fixed on the big box ( Green color that contains a glass in Blue )