I'm so excited for you!! I like him, and you're comfortable on him which is a huge plus :)
Even if he's a chubster, if you feel confident and he does exactly what you ask.. he's going to be a niiice ride.
It's like Sky.. I walk, trot, and cantered him (scared of the actual cantering) even took him on trails with 2 green horses and one barn sour horse (horrid idea but it worked!) and I trusted him to keep me safe. He's the biggest horse I've ridden and we just click. It makes no sense but I ride best on him :)
I hope the PPE goes well! :)
"Strength is the ability to use a muscle without tension"