Bravo!
There we go! I actually knew what sort of galley it was, since I'm very deeply interested in Mediterranean warfare during the vAntiquity and early Medieaval times (chiefly the Byzantine fleets), but your explanation know adds that crucial info to other, less knowledgeable members of our community!
I highly commend you for your noble rise to the challenge, my friend!
Now, only one kind suggestion: Since most people, admittedly don't know much about this time period, maybe one ought to put the galley type on the drawing (and if you already have done that, please ignore this last statement!
)