Just finished a large 1/6 scale print and figured I'd share the stuff I wish I'd known before ruining three copies. The big one is hollowing with properly sized drain holes. At this scale the weight of solid resin will rip supports off your build plate mid-print, and even if it survives, uncured resin pooling inside will slowly leak out of any seam for months. Put drain holes at the lowest points of the orientation you actualy plan to print at, not where they look convienent. Orientation matters more than people think. I tilt big pieces back at a shallow angle and keep the face off the plate entirely. Face-first prints look tempting because you hide the support marks, but the peel forces on a large flat facial plane are brutal and you'll get layer shifts or a failed chunk every time.
For cleanup, work in stages. Pull it off the supports while it's still a bit soft, cure, then fill the dimples with uv putty before you even think about primer. Trying to fix pockmarks after priming is misery. And go easy on the clearcoat at the end, a couple of light passes beats one heavy one that frosts all the texture you spent ages painting.