No visible wires is getting almost impossible to do, especially with the power requirements on the new gpus, for example, you want to run dual 285s, how are you going to hide the 4 6-pin power cables connecting to the card? They're positioned right out front now, makes hiding them next to impossible.
I consider a number of things when looking at peoples wire management. If I was considering it simply as wire management (forget aesthetics) and with stock resources (no mobo cutting) then I'd give this a 9/10.
The other consideration I look for is case and other limitations, some cases just suck for wire management and as mentioned above the new gpus suck for hiding cables. But that doesn't really apply in this case.
So, for this job I'd give a 9/10 unless including aesthetics in which case I'd drop it to about an 8/10. To get it to a 10/10 I'd need to see some mobo cutting and sleeving.
my 2 cents on wire management.