Nah. Just go for it. I did eventually install some eyelets from BBQ Guru. Other than that, you're set. You already have a built in therm, so no worries there.
Welcome to the WSM addiction Paul!
Your new WSM is gonna be soo dag-gum easy to use, you'll wanna get rid of your kitchen oven and any other smoker around.
And that Robert Clark from Perryville is a genius! Everyone has done his mod version over and over and over with outstanding results!
You'll see...
Have fun with your first cook