Need help with enclosure design for 2 RE SXX 12 Dual 4Ohm Woofer

I recently bought 2 RE AUDIO SXX 12" woofers and plan to build the enclosure (vented) by myself (first time in my life). Since the manufactorer's web site only provides a box calculator for one woofer, can somebody kindly give me some advice on dual woofer enclosure and port measurement? In order for the box to fit in the trunck, the size constraints are: Length < 35", Height < 16.5". I prefer SQ over SPL and hope the bass hit as hard as they can. Thanks so much!

The T/S parameters are listed below and more info. can be found on http://www.reaudio.com/woofers.php#goto_sxx

Qes: 0.32 (Electrical Q value)

Qms: 4.4 (Mechanical Q value)

Qts: 0.30 (Total Speaker Q value)

Fs: 30.6 Hz (Free air resonance)

Vas: 47.6 liters (Equivalent compliance)

Xmax: 22 mm (One-way, Linear excursion)

SPL 1W/1m: 88.1 dB (Efficiency)

Sd: 480 cm^2 (Effective Piston Area)

Re: 1.9 Ohm (DC Risistance)

Znom: Dual 4 Ohm (Nominal Impedance)

Pe: 1000W (Thermal Power Handling, RMS)

BI: 21 (Force Factor)

Displacement: 0.16 cubic feet

Weight: 24.5 lbs.

Enclosure recommendations: optimal 2.0@33Hz, Compact 1.5@35Hz