You can connect the headboard using L-brackets or you can just rest that headboard behind the bed.
The platform bed is easy to make. How you want to finish it is up to you. You can paint it, add beadboard, hand paint, stencil, decoupage, padding and fabric to the headboard or staining. You can leave the ledge plain, decorate it another way or leave it plain. The headboard could be another size or shape.
I'm not sure of the exact price of the completed bed but I can tell you it wasn't much compared to what it would cost to buy it.01 02 03