Looking for a Mazera's Installation Expert, Banana

The project is in Kiambu county,a Banana. The house construction is complete, just looking for design ideas for the exterior and stone experienced contractors.  I can send you the blueprints and photos.

Here's the front and side view of the house currently - see attached original designs. The plans changed a little during the construction process, but I want to incorporate more natural finishes in line with the original plan. I just need the help of an exterior designer to incorporate locally sourced mazeras stone and an expert installer to get us there. My style is simple, clean lines, classic, mid century modern design. I do not like anything trendy or over the top.