Thanks for the follow up, TJW. The discussion here will likely help others through the process, as well. I’m glad you accomplished the task, and I imagine you feel good about doing it yourself.
Just to let you know I've finally found the time to complete the maintenance.
It turns out that two problems knocked me sideways:
1) the February 2012 version of the Shop Manual incorrectly states to align the marks to the 'top notch' where it should read 'bottom notch' and
2) I didn't take into account that it takes 2 full revolutions of the flywheel for both cylinders to complete 1 full sequence.
Taking all of the above into account it suddenly all made sense and the rest of it was a doddle ...
Thank you very much everybody for all your kind help.
tl;dr Use the BOTTOM MARK in the camshaft inspection window
I think the inspection interval for the 2015 model and later is 16k miles. I was planning on looking at mine at 10k. I doubt they will be very much out of spec. I donít hear the valves at all at 7k.