There are quite a few Marquetry techniques, the window method is my favourite and described here. Stock veneer is about 0.6 mm thick, easier to cut but little margin for finishing, one rub too many and you’ve gone right through. I preferred cutting my own about 1mm thick, much harder to nest but a very rewarding pastime.
Examples of some other Marquetry works of art that I have admired.
MARQUETRY