Ok, so i found a video of basically what i wanna do. I'll be using a different flush mounting facsia.
Can you see that yellow wire with the fuse on it? It's in the attached PDF instructions you get with CTSBM005 harness (included in CTKBM01 kit). The instructions give you some vague idea where this wire goes but i don't do vague very well. So at this point this is the only show stopper i can see.
Well that and finding a suitable place for the usb cable from the CD-AH200C. I currently leave my phone in the door grab whilst driving so i don't forget it. But don't fancy routing the cable through the door card. 2nd choice is ashtray