I can see that the physics of speaker design can become quite complex!

Just a couple of short follow-ups:

Is the 15 1/8" dimension (shown on the pro pi7 plan), the inside measurement of the port, or from the outside of the cabinet to the inside of the port?

If one wanted to stay with a straight port, could it simple exit the side? I know this may not look the best, but I was wondering if it would be worth considering.

Thanks Wayne