Paul, I do marquetry and I have taken two different class, one at the American School of French Marquetry with Patrick Edwards and learned how to cut with a Chevalet ( In fact I made one of the Chevalets to cut with) and also, I took a class at Mark Adams School of Woodworking with Paul Schurch and we cut on a scroll saw but not the double bevel cut method but instead we did the packet cut method (much easier). The classes were great and I learned a lot. But if you want to learn without taking a class, I highly recommend Paul Schurch's two videos ( in fact they are part of taking his classes requirements ) and they have everything you need to know on how to do the marquetry packet cut method and has the same information in them that we learned at the class. I guarantee that you will be able to do marquetry if you get them … given your ability of being a good scroller.
Richard
http://americanschooloffrenchmarquetry.com/WPASFM/
https://schurchwoodwork.com/