The Hawthorne Silver Iris can be pretty simple. The driver is a coaxial design and it comes with the crossover. You would simply need to buy a suitable piece of plywood or MDF and have someone cut the appropriate sized hole for the driver. Screw the driver to the baffle "board" and hook up the crossover to the driver and you are set. You could use another piece of wood or a couple of shelf brackets for the anti-tip feet.
The Hawthorne SI is an open baffle speaker. Put simply, its a driver mounted to a board. I don't think it can get much easier than that.
Enjoy,
TIC