Not that much smaller - that's 20x36. Though 3 floors, and 10' ceilings.
Made the corner boards myself out of azek and azek knockoff (Mainly rhino XO, it's cheaper.) The actual "corner" of the columns is Azek - the make a 5/4x5 or so premade corner. I'm big on proportionate masses, so that was way too small for me.
So I put an azek cleat up to butt the hardiplank up to. Then I padded the corner - you can see on the ones that aren't done yet, only 2 are finished. Put a 1x12 piece of azek (rhino actually) on each side of the corner, than put the azek premade corner over that. Balanced it on the other side of the pilaster with a piece of 5/4 to the same rip, overlayed to form a J channel over the hardiplank.
Hopefully that'll make sense if you look at the pics. I wanted some strong greek revival allusions
Thanks on the land, I'm working on it - clearing the forest here got me into tractors. Hired a guy with a kubota, and as I was helping him cut it down, decided, "I need to get one of those"