Adapting the pattern to my own sizes ... Culprits?

Good evening, all!

As the sewing machine is occupied by my wife and I am waiting for my kit and the rulers to arrive, I spent a lot of time watching videos and pondering.

True to my nature (apparently...), I will be going "full in", hence I will be using my own measurements for my coat - either I end up with a decent-to-perfect coat, or I will take it like a man! (I.e. having a tantrum, throwing it all in the bin and then start anew...)

I know my height (68 1/3"), Chest (39 3/4"), Waist (35 7/8") and seat (37 3/8").

Posture-wise, I have rather broad shoulders, a hollow lower back and rather slim hips.

Question 1: Would these measurements be too far out of the ordinary to adapt the pattern, using the rules and fixes measurements used in the video?

Question 2: Are there any other culprits I might want to keep in mind, before drafting the pattern or rather cutting the fabric? (The way things are going, I am probably continuing to lose weight - so I will probably end up having to take some seams in, instead of laying them out...)

Any insights and experiences would be very much appreciated!

Cheers

Jeroen