Another desk that I finished last winter. Top slab is oak with a walnut bottom cabinet and spalted maple cabinet doors. Finish is 4 coats of "tung oil" and 4 of wipe on poly.
The simplicity of the design sure brings out the character in the wood. Your design style is similar in philosophy to the arts and crafts people, but with more emphasis on the character of the wood. I like this approach.
In our household, desks have to hold a huge pile of stuff, so multiple drawers and file cabinet style pieces are necessary. I finally bought a U shaped corporate desk system from an office supply, and that has done pretty well for me. My wife has a custom made built in item with multiple file drawers, etc. I suspect your business life has been simpler than ours, or confined to the workplace… (-:
In any case, this is an impressive piece, thanks for the posting.