I created two sofas, a love seat and a table by modifying the modern chair. I added a back extension, tipped the back back 10 degrees, and angled the seat platform down a few degrees. Considered doing Adirondack arms, but my wife preferred the rectangular shape. The table is a variation of the 2x4 patio table (base construction similar), but we substituted pine 4x4 legs for the 2x4s, and implemented a 2x6 "picture frame" around Mexican tile on top.
I used pocket screws to attach the arms to the sides, and also to hide screws on the table "picture frame".
All-in-all, I would say this is an elegant-looking patio set that should last quite a while. Very solid, very heavy to move around (my only complaint).
We plan to add some colorful throw pillows.