Good looking build, but you should maybe pay more attention to cable management, if you want it to look better, try pulling the cables as much behind the backplate as you can so mimal amount is visible (Not the best expression, but english is not my first language) :)
You should have them available on your PSU, well perhaps you would if it wasn't a crappy Rosewill PSU....
EDIT: To be fair, there are actually two options here, either your PSU doesn't have those pins... or your an idiot. I thought I'd give you the benefit of the doubt....
With your case sitting straight on the carpet the feet are going to sink in and restrict the air flow to your PSU. I built a little trolley for mine with plywood, some ¼ round edging and 4 wheels that rotate 360 degrees. I drilled out the area where the PSU fan sits as well as the area where you can add an additional fan in the base of the cabinet. I put the trim around it so there is an edge to prevent the computer from possibly slipping off and attached the 4 wheels. It works great for moving the unit to access cables and guarantees proper air flow for the bottom of the case.