The blue planks are square edged Shiplap pine boards (sometimes called Channel siding), with a "nickel" gap. The subtle spacing between boards adds a nice shadow line, and keeps your eye from noticing movement between the individual boards.

would love to know where did you find the wall hooks or is that custom?

The hooks are custom, but very simple. They are birch dowels set into holes drilled into plywood panels at an angle, with an eased edge and a beveled end. It's worked really well!

I really like the Narrow stiles on the door. What door company are you working with?

Laura, it was a company called Drewexim from Poland that had a Maine importer. Most of the european door companies like Zola, Intus, Makrowin or Klearwall can provide a stock door just like it, there are now US distributors for all those european brands and their prices are often less expensive than what US door manufacturers provide with that level of hardware and triple glazing.