Island Overhang Support
The template maker may make recommendations like installing metal supports if an unsupported overhang exceeds 10”.
Storage Under Island Overhangs
If there is storage below an overhang, the template maker may recommend that the doors or drawers be lowered to provide at least 3/8” clearance between the top of the door and the bottom of the sub top.
Islands and cabinets with waterfall ends must be plumb and square.
Waterfall ends don't actually touch the floor. There is a small gap (1/8"-3/16") at the bottom to allow for expansion, settling and shifting.
Ideally the vertical edge of the waterfall is the same width as the finished edge of the countertop.
The standard appliance edge is not laminated. It is used at the range, against a panel or refrigerator. If a different edge is desired, it must be specifically requested at template.
The template maker may suggest adjusting the desired splash height either higher or lower to accommodate outlets or to hide wall damage.