where is the best reference for all the tables and their schema in the NetSuite2 data source? i thought it was in the records browser but don't see it there anymore

Setup > Records Catalog

TY - was aware of that one but not all of the tables are visible from the main screen, you have to drill in to see them as Joins, which seems odd to me.

Yep, was odd to me when I first looked at it too. For example, if you search for transactionLine ... no results!? It's a good tool ... but flawed as it is.