VC Studio Inc. The look of sandstone (as well as many other looks) can be achieved with concrete.
Seamless pieces of almost any shape can be created. High performance concrete is cast thin so there is less weight. Support brackets can easily support a hearth, a sink, or a shelf. Almost any color can be created as well.
k6walls We had a local metal fabricator do the work. You could check with some designers or contractors in your area who have had custom metal work done before to get a contact for your project.
Fireplace wall. Add free floating live edge hearth. Maybe small bands of metal to break up the stone. Then use some additional wood on tv wall to tie it all together.