I'll post a picture soon. Right now, it's all covered up(surprise company). The "slats" are oriented such that the grain is running across the width of the table. I think the nails may be too restrictive as well, so I'm thinking screws with slotted holes for the support structure. I did leave gaps in between the individual slats for expansion(Louisville is in a river valley, and the summer humidity can be comparable to the Everglades at times), as the wood is very old and very dry. I initially wanted to use pour-over epoxy to finish the table, but thought that it may restrict cross grain expansion come spring. I don't know a whole lot about epoxy, so that could be way off. The slats are, on average, about 1.5 inches square by two feet long. They're all very dry red oak. I left about 1/32 of an inch on either side of each one for movement, and I used thin, rough pine for the supports, so any movement should force it to crack before the top. Worst case scenario, the thing expands incredibly and destroys itself. It was all scrap wood, and is just going to be an extra table for "whatzit" storage anyhow. I'm treating it as an experiment, to try different things, so if it works out, it's a bonus. I really appreciate having people like you to key me in to things I may have overlooked, forgotten, not known about or handled incorrectly. Makes the whole process much more pleasant.