This is how it is setup mine has larger motherboard than yours plus looks better with the cable re-routed up the side of the expansion slots and under the H50 fan.
Cable management is a bit better now but would still like a cover or something to hide them. Thats the only regret i have with the Antec 300 the cable management sucks.

Cable management is a bit better now but would still like a cover or something to hide them. Thats the only regret i have with the Antec 300 the cable management sucks.