Here's a pic that shows the old window ledge from afar. And here it was yesterday:
Step 3: We bought a big piece of wood from Lowe's and cut it to to right shape and size, adding 7 extra inches to the width of the seat.
Step 5: We bought some heavy-duty fabric at Joann's reminiscent of sand (as this is still supposed to be a Kauai themed room). We very carefully cut and stapled the fabric over the cushion and wood. Then glued the whole thing down to the ledge.
We're still on the hunt for pillows. These are some experimental pillows from Walmart, which I like, but we'd still like to find a palm leaf pillow. We figure we did this all for under $100 and 1 1/2 days of work! We tested it last night and it's long and wide enough to sleep on! Now I'm ready to curl up and read a book.