Increasing the depth about a 1/2" to 15-1/2" got the volume pretty close to the same as the stock dimensions
So I ended up with about 10-5/8" deep, I had to fudge the volume of the braces and cleats... And my width actually ended up at 14-15/16" after it was all glued up. So I figured better to round up than round down...
Also, if I decide to roundover the port front say with a 1/2" roundover for aesthetics, do I measure the port length from right behind the rounded portion? Basically the straight section of the port?