Box Design For 2 ZVX 18"s

[Motorboat KER]

Hey guys. Starting to gather materials for my next big build (starting 7 months early since my lease is up in October).

I decided to go with 2 ZVX 18"s (powered by 2 Skar 2k).

Anywho... I plan on getting a ford escape (used) so I am basing my current box specs off of that.

Sub box reqs:

4cubes ported each

0.16cubed displacement

So I came up with a simple ported box:

Port will be a slot port along the bottom of the box with the subs mounted above it. Does anyone see anything wrong with the current design? I feel like I could maybe use more port...