Back-painted glass panels, done right
Back-painted panels are made from tempered glass, and tempering sets the rules for the whole job. Tempered glass is heated and rapidly cooled so its surface sits in compression, which makes it several times stronger than ordinary glass. The catch is that it cannot be cut, drilled or notched afterwards. Every outlet opening, every switch opening, every notch around a window sill has to be cut before the glass goes into the tempering furnace.
So a panel backsplash is measured twice. We template at the same visit as your countertops, which lets us plan the panel layout, the seams and the colour. The final panel measurement is then taken off the installed top, because the glass sits on the stone and a sixteenth of an inch matters when the openings are fixed in the glass for good.
Panel size is limited by what can be carried into the house and set on a wall without flexing. A long run is divided into panels, and we put the joints where they look intentional: at an inside corner, at the edge of a window, at the line of a range hood, never in the middle of the wall where your eye goes first.
The wall has to be flat, because a painted panel shows every wave in the drywall behind it. Plenty of Austin's older ranch homes have bowed or out of plumb walls, so we check with a straightedge at the measure and tell you up front if the wall needs skimming first.