I was originally thinking, something more basic, have a shaker feel to it. After looking at examples, It think my original plan may be been a bit basic.
Here are a couple examples of my first thoughts:
Or this window Example
Now I am now thinking of going with a more detail and definition. Hopefully giving a little more detail to the trim could go well with the reclaimed hardwood floors.
Craftsman Moulding Ideas and Inspiration
Craftsman Door and Window Ideas
Craftsman Baseboard Ideas
This is still the basic baseboard but maybe we give a little extra details to any of the cased openings.
The Joy of Moldings This is a fantastic website with great ideas and resources.
Craftsman Trim Install Guides
This one is a little fancier wtih the angled parts at the top
Craftsman Moulding Systems
Home Depot: I do not have a link but I think Home Depot has a Craftsman Moulding System
Here is a pinterest board with lots of examples
Our Plan Starting from the Top down
Top of Wall — Cove Moulding got the idea from this page https://windsorone.com/back-of-the-board/streamline-builders-finishes-up-for-a-white-christmas/
Top of Windows & Doors — http://cf.lovegrowswild.com/wp-content/uploads/2015/09/Farmhouse-Window-Trim-18.jpg
Bottom Of Windows
Think it will come together nicely?