Tim - Sometimes I should remind myself the terms I might find in common usage, or that I find descriptive might be neither...
Belly, dish - Ya, you got it
Roll a grain - when I score with the grain and cut near the line, say plunging & ripping the lower table of a scarf with a chainsaw, and then rub a hand over the ripped edge, the grain "rolls off" exposing the layout as a physically existing plane.
SLSR - Snapline Square Rule - I'm datum dependant, snap everything all the time, no matter which layout disipline I'm working in. I just find it more efficient to get into a rhythm and plan on and estimate for datums, than to hem and haw over which to snap and which maybe not to. Plus I find it's an investment that pays dividends.
Non-ninty line - Layout lines are in these disiplines are rarely ninty from face, so tooling which registers from face isn't necessarily an efficient approach. I prefer to pick up a tool that I steer with my hands and eyes than one which rides the timbers surface.
