Can someone check my plans for me?

[barnyard]

Sometimes it's better to get an extra set of eyes on your plans!

The box will be 20" wide x 6" tall x 16 " deep. It will house a single downfiring RE8. It has a port that is 1.5" wide x 4.5" tall and an effective length of 28.36" I have attached a drawing if it'll help

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[barnyard]

Ok, I took some better measurements under my seat, and added 1/2" to the height, making a total of 5" internal height. From the picture, did I measure the port length right? If so, then the remaining volume is exactly .5 cu. ft. allowing .09 for the sub.