I would love dimensions.
I used the first basic option, except the shop pt the sub on the angled side insted of the flat side liked I asked.
I did not have time to build it myself after i found out the factory sub was pretty lousy in open air. so I "subbed" it out do to time restraints LOL i will measure the eaxct tonight for ya.
Measurements are close to my first drawing 20 wide by 17.5 height. 5.5 on the bottom and 9.5 on the top for the wedge. These are all outer diameter measurement .