I managed to get one flower box built and stained. Flowers are doing great too. I replaced most of the potting soil they came in with some miracle grow potting soil and the next day watered with miracle grow vege and floral mix. They look great!

Here's some pics of my box. I need to build another one for the other side but doing this stuff with one arm isn't easy lol. Maybe today...or tomorrow.

The last pic is the tray I bought with the flowers for the second box. I love purple and pink flowers.