Drilling holes, which is actually sinking the screws to hold perch mounts will not drain humidity from the cage. The holes will be filled by the screws used to mount the perches.
This is a 6 foot cage.
This is the cage now used for the Royal.
It is 4' x 2' x14"
It has been "decked out" over the years. This early version of it still had 3 separate perches.
Every cage here has 3 perches at various heights but they are evenly spaced out so the snakes can balance their weight.
Another variation of the 4' x 2' x 14"
It is the top cage here.
You can always add a mossy hide, an additional water source, different sub, or mist the enclosure. Simply putting screws into the cage to mount perches or a shelf will not drain the moisture out of the cage.
You will be OK doing some little mods. Your cage looks very nice and perches will really add some display excitement for you and some additional exercise and space for the snake.
Good luck.
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