Yeah, so for the one I built i did use pocket screws just as an easy way to hold the cross-sections down to the bottom. All joints were half inch dado cut halfway through the material to fit together snugly. Everything was glued with wood glue. For the top piece I then covered everything in wood glue and put the top on and just clamps and brad nails.
In each corner where the onefinity would line up I glued up some thicker pieces of wood inside for the mounting hardware to sink into.
It was almost definitely overkill but it made me happy.
