Wildthing Taz here on the board has a similar offer. He also helped me out with an "access window" kit so you could go straight through the back of the transom assembly instead of working through the little side holes. It worked out very well for me. I was going to try and organize my pictures and do a step by step but Im not finding the time.
Ill post these until I get the rest up.
He provides a cut out template, drill bits, cutting wheels, gasket, ss plate and mounting screws.
Here is the template being cut out.