Basic Room Box Kit - 1/4" (1:48) Scale. Interior Room Box Dimensions are 4-3/4" Wide X 2-1/2" High X 2-5/8" Deep. Exterior Dimensions are: 5-3/4" Wide X 3-3/4" High X 3-1/4" Deep. The opening in the top of the box is framed and includes clear acrylic fit to the opening. This room box is the same dimensions as the Safari Room Box but there are no themed cut-outs so you can decorate it with any theme you desire.