I'm building 10 cabinets for a wall unit (5 base and 5 bookshelves on top) out of birch plywood with poplar face frames and doors. The cabinets wil all be painted. No outsides will show since it will cover a complete wall. I'm planning on screwing and glueing and biscuting the carcasses togethers. Not sure what the best way of putting the back on. Should I put the cabinets together and then route a rabbit or run the boards along the router table and then put the cabinets together. Or should I just nail and glue right onto the back? I'm just getting back into woodworking after a 20 year hiatus and appreciate any advice I can get!

Adam