Nice! Couple of tricky questions tho.
20 - rimless or do not posses a full rim? Because there is an xmetal piece that has no rim but is not an "xmetal"
23 - implies that it has a flexible bridge?or because it has a solid nose bridge?
20 - based on there being 8 X-Metal models, which frame(s) does not possess full top and bottom metal orbitals?
23 - solid nose bridge