Masonry Opening

[springboard]

I have no problem using my Arroway textures for this building I have similar high res, BUT does anyone have any VRay/Max suggestion on how to bend the geometry or texture around the opening door laid stone pieces (keystones)? The main field of stone should look more hand made/organic like this laid in around the opening with visible mortar joints all locations.

Thanks

[springboard]

The Stone course at the top of the wall is also an issue but I assume I can create individual loose geometry with a buff mortar shader to match (unwrapping each stone cap piece) its only like 5M wide building Plus other in the background. This is something that is re-occurring for me also. THanks