Nice to see another PT around here. Pics of trunk? (Even shoddy work helps us get ideas...)
What are you going to do about paint? Exterior color match? interior match? new color? texture?
I've got a 1.5 Gen (06+) and my dash bezel is a little easier. The A/C controls are already at the bottom, with buttons above (Defrost/Hazard/Passenger Airbag light) and then the radio, and the window switches, then the analog clock. All I have to move are the buttons and window switches and remove the clock. I won't have to mess with vacuum hoses or cabling etc.
I was still trying to decide if I want to mount in the trunk in the cubby hole or under the seat with a kick plate to protect it. That's why I wanted to see what you've done.