James, this looks really daunting but just in time for Summer!
Just finding all those hidden fasteners would be worth it's own diy guide.
For those who missed
Meir's diy guide, here it is:
http://986forum.com/forums/diy-project-guides/37245-dashboard-cover-removal.html
& this one:
http://986forum.com/forums/diy-project-guides/19207-diy-dashboard-assembly-instructions.html
http://986forum.com/forums/performance-technical-chat/42802-interior-vent-debris.html
I hope this helps others do this job and hopefully share the many gotchas !