I just sold a 13x18cm example. It came with two 13x18 cm double plateholders, which would I presume be an advantage for you. The big downside is that the cameras are made of a soft-ish wood (I think pear wood) and on my example at least, the sliding wood block which locks the baseboard would hardly move - the same problem with the filmholder sheaths, they would move by hand but not smoothly. Also, because of the soft wood, quite a lot of the screws securing the fittings to wood parts had stripped their threads, makling it necessary to take them out, pack the holes and replace them. I am sure an FKD could be fun to play with, but they're not as good as they look!