Obviously, plank the deck the way you would if you were building a carrier. Remember that on IJN carriers the planking ran length-wise on the deck, not perpendicular like US carriers.
For the tie downs, I would suggest drawing a master and sending them off to get photoetched...not a complicated process. You can also etch your own, I wrote an article on how to accomplish this on Modelwarships.com in the How-To section.
Regards,
Jeff Herne
Modelwarships.com