Calculate Inside Dimensions VS External

[crazyone 10+ year member]

I was hoping someone could help me calcuate the inside measurements for an 3/4" mdf enclosure.

I'm making a clone of my old box which I have external dimensions for.

2x 13.5" height x 30" width

2x 13.5" height x 17.5" length

2x 30" width x 17.5" length

The main requirement that throws me off is that the Width and Height cant get 3/4" larger with the additional piece of wood screwed into it.

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[z0n3d0u7 10+ year member]

So 30 x 17.5 x 13.5 is the outter dimension's? Is it a dual chamber enclosure?

Assuming so, is approx 1.5cuft per chamber.