Three finishes on one piece means the order of work is fixed before anything is applied, and it cannot be changed halfway.
Gold goes on last. That is not a preference - it is a constraint. Gilded surfaces cannot be masked over: adhesive tape lifts leaf, and any solvent used to clean an overspill dulls the burnish permanently. So every other colour has to be finished, cured and protected before the first leaf is laid.
The ivory goes on first, because it is the lightest and the most easily contaminated - a speck of green or gold dust settling into wet ivory will show forever. Then the green marbled work, which is done wet and blended by hand, and which needs the ivory around it already hard so any overrun can be cut back cleanly.
Only then are the friezes, mouldings and feet gilded, working outward from the middle of each run so the gilder is never reaching across finished gold.
Get the sequence wrong and there is no recovery - you cannot un-gild a moulding to repaint the panel behind it. On a piece like this the schedule is as much a part of the craft as the carving.