One thing to remember is to keep them on the small side. It doesnt
take too many LPs to get very heavy. On my last move I boxed up about
2500 of my LPs. Fortunately teenagers with strong backs are available
for cheap. Possibly you could make the units about the same size as
the old standard milk crate, and then after stacking modularly (is that
a word?) you could use a removeable facer board trim.

Paul