Building my first box...just need some people to quickly run over my measurements so see if I have it right.

Building a box for a single Pioneer Premier 12" Sub. 400rms. Tuned it using RE Enclosure Calculator to around 32-35hz. Sub firing up and port facing cabin. Located in trunk.
http://www.pioneerelectronics.ca/POCEN/Products/Car+Audio+Video/Subwoofers/Champion/TS-W1208D2|D4?tab=B

Measurements...
Width:25"
Height:12"
Depth:20"
Port Height:10.5"
Port Width:3.5"
Port Length:39"
Port Volume:0.85 ft3
Box Volume:1.9 ft3
Fb: 35

Does the box volume seem a little to big?
If I'm missing anything important just let me know.

 

Maybe just a tad big, but 1.9cf @ 32hz should give you tons of low end bass.

 

If its a trunk car, i would face the sub and port towards the trunklid.

RE Enclosure calc is .2 cubic feet off and the tuning showed is lower than the actual tuning by up to 4-5hz.

If you are using the RE calc, i would make the enclosure 2.3 cubic feet @ 34hz