Maybe painted wood?
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Corner
Hardie
Hardie corners?
This is a rendering but I feel wood works if we can get it to be stained or weather to be gray. Harder might work too.
Might be Hardie post
Nice double post with thinner wood vs. big fat beam. Bob? ledge with stone sits out from vertical barnwood with a ledge...this works nicely.
Posts might be hardie. Trim on lower level corner but not near windows.
Hardie application
like the gray brown barnwood. Looks like a ledge between the stone and barnwood.
Metal cylinders. Nice but why spend the $.
Maybe painted wood?
Q