Looking for something on Dromon construction, I stumbled on this (https://www.persee.fr/doc/rebyz_0766-5598_2015_num_73_1_5044). While mainly on 10th century ships, there is a prequel on earlier vessels. Interesting stuff on horse transportation too.
Thank you. That is an interesting paper. I'm not sure if I will ever get to paint a Byzantine fleet, but it is good to know about these things just for the sake of knowing them.