The "Tale of the Heike" only tells us that the Taira used big, Chinese-style ships for troop transport and smaller fighting boats where to place their prominent men. No detail about either ship type is given. I went through the Japan: history entries on this site, but found nothing that would help.
Consequently, I'd be grateful to anyone who could point me in the direction of any good online source, preferably with pictures an/or descriptions. Printed media won't help me, as I live in Hungary and won't be able to lay hand on them. Thanks.
Edit: Thank you for the suggestions. I believe I have now the visuals that I needed.