could i even fit 8 cubes...

[dvrmstrng 5,000+ posts]

with max dimensions being

40" wide

20" tall

30" deep

if not the tall is the easiest for me to change....how much would i have to change it?

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[RAM_Designs 5,000+ posts]

That's roughly 11.75ft^3 before any type of bracing, sub dispacement, or port displacement.

 

[PESteele 10+ year member]

im only gunna be getting about 10.5 before port and bracing displacement so you should be fine