I know it’s a more expensive option to have Alumacraft do it, but I think you’ll be happier and safer in the long run. I know a few folks that work there and I’m told that there is some hardware and retrofitting that can’t be “sold” when you are looking for a side console to “buy”.
The other piece to keep in mind is insurance. You may want to speak to your agent about you adding that piece yourself vs. having it factory installed.