Yeah, it's like a barrel full of monkeys in there...
I intend to remove the turbo outlet (to the intercooler), the turbo inlet, the washer bottle, all the air filter housings that can be pulled, the cabin air intake ducting etc. (just like when replacing the air filter element).
The A/C lines will be right in the way so I'll just have to work around them. Being an OB/GYN might help.... if I was one.

Good thing I have a great range of socket extensions and universal joints (wiggles) on hand...
I will leave the turbo in place, along with the exhaust. I'm hoping I can even leave the lower alloy reinforcing plate in place (unless I drop something!). Removing either the valve cover or the reinforcing plate, exhaust and turbo hugely increases the amount of work required and I've seen YouTube videos from folk who have managed this task in this manner. It should even be possible to remove the manifold out the top once the studs are free.
What would be a deal breaker is a seized or broken stud. The general condition of the entire car is very good so I'm hoping I don't go there. I'll certainly get penetrating fluid on the studs etc. overnight in an effort to avoid "issues".
I'll be sure to photograph and write up the process...