THAI has a section on their website with seat maps. It is found by selecting THAI Company Information>Our Aircraft, then selecting the plane you're interested in.
That brings up an internal .jpg seat map. These seatmaps yield additional information not seen on seatmaps from Seatguru, etc. Most notably, seat pitch is many times not consistent throughout the cabins. These maps reveal what seats have different pitch. (Ex: on 773, first Y cabin has 34" pitch; the other Y cabins have 32" pitch.)

Unfortunately, you used to be able to zoom these maps up so they were legible. Something seems to have changed on the THAI website, and they now come up in fixed windows and can not be expanded.

It seems to behave a little differently for different planes, and I've tried right-clicking, opening in a viewer, etc. but nothing seems to work for expanding them up to a reasonable level.

Anybody else have any ideas?