No idea on the toeboard question, but I wanted to say thanks for the clear pics as I'm about to tackle the door step myself! Going for the same Heritage panel. The hardest part for me is knowing how things are meant to be. Could do with the exploded diagrams on the likes of minispares but in high quality and drag drop build instructions! Seeing whats behind that heritage door step panel at the A post in your pics was like an 'ahhh! I see' moment :)
I've been at mine on and off in various forms for 10 years (I did the same as you and switched project shells half way through, triggers broom this one). This year will be the year of progress! PS. If I'm reading this post in 10 years and it's still not done I owe myself a proper kick in the balls.