Hello and thanks for the great reply. I learned a lot from you Wayne.
Here's where I'm at with design.
I building this enclosure arounds a TC Sounds TC3000.
QMS 6.1
Res 4.63
BL 27.1
Mms (grams) 373.00
Cms uN/M 136.00
Sd (m^2) .0820
Vas 127.60
Fs 22.35
Qes .330
Qts .313
nO 4.16E-03
SPL (dB) 88.19

This driver has quad 1.4 ohm voice coils that I plan on wiring for a .35 ohm load. That's why impedance rise is so critical. I want to a play one tone and one tone only (51 hz). I know that if I use 2 1000 watt RMS amps and wire it that way I will likely cause more than just hearing damage if I miss that target frequency. Anyway, below there should be a basic diagram of what I'm looking at building. All the dimensions are outside dimensions. The depth will be 17". I'm planning on using 3/4" MDF, but would open to doubling the outside wall thickness if needed.
Some of your thought would be great.
Thanks again and have a great day.