Welcome aboard. Looks like you did the pictures just fine.
You might look around at comments on that power supply -- it may be a little light. It looks like the equivalent of the M3-ATX, which I believe has been troublesome in some applications.
With the case you're buying, you end up paying for a 300W power supply you can't use except for testing in the house. If you don't mind a little shop work, you could probably modify a "project box" from the Oz equivalent of Mouser, and get a tighter fit. Refer to the first few post in my worklog for a similar idea.
You might spend less overall if you disassemble a 7-inch netbook PC (you can find them with 120GB drive and XP installed), add a touchscreen, and build it into the double-DIN area of your dash.
One consideration, though, is that most netbooks come with only two or three USB ports, where the motherboard you've chosen has eight onboard USB ports. That means you may might not need a powered USB hub for your peripherals, so that's an advantage.
You're off to a great start, Nosajs. You did your background research before asking questions, and you added pictures and links. That's what we like. Document everything -- we'll be watching.