looks ok.
On the main power wire i would run two different fuses, one close to the back batt and one close to the front. you can use the second batt as a distro, but i would rec a small fused ditro block. you can find them online on the forums for about $15.
The deck may end up causing issues, in theory you can use the splitters, i'm just worried the voltage is already so low, that after the splitters your amps will be recieving very little voltage from the radio.