That's about what I figured for mine. I just hate using so much of the space that I gained from getting rid of the engine box for a livewell. I dive and fish. Space in the rear is nice in both situations.
Below is a picture of the livewell I'm planning on putting in. It is 20.5 in. tall x 23.00 across at the top. How wide is the livewell that you have installed?
Livewell - <a href="http://www.boaterscatalog.com" target="_blank">www.boaterscatalog.com</a>