Moving along with the soldering, ta for the advice. I plan to build the amp cabinet from plywood until I find a donor cab or build a better one. I have looked on the net but not found any dimensions. Looking at a photo on a website, I think the speaker baffle board is 20″ x 20″ x 1/2″ . The casing looks 3/4″ x 9″ wide and length to fit outside dimension on baffle board. This is the site I found the photos on.