I can't remember if they were bottom offcuts or not, but it is highly likely.
Basically I'm a believer in sizing parts to the person, rather than the plans. I wanted larger walkways because my boat is a pickup truck. I can measure the console if you like, but moral of the story is figure out how wide you want your walkway (12" min, I like 18" if you can make it fit), then whatever is left over is your console. As long as your helm controls fit inside it, it really doesn't matter how wide your console is. Mine are oriented vertically, so I could have gone down to 8" of width, but then it's a little wonky.
The console will take 2 hours to build. You can always build a second in very little time. If you're feeling extra crazy, you could put in some galvanized or aluminum angle, then just through bolt to the consoles. Size them to fit the little one, and block the bottom of the big one until it fits. Now you have a convertible skiff...