Hi Steven
There have been very positive reports about the rear camera kit which Calvin at SC430MODS.COM supplies.
It appears to be an easy fit, not having to remove the head unit to fit it.
After much procrastinating, I am on the verge of buying one from him and from reports, I would not hesitate to fit it my self. Especially as I have removed the boot linings previously to do a wiring job.
I don't know exactly where you are but I am just over the Pennines from Lancashire and would be happy to assist if you feel that you need some practical and moral support.
Regards, Anthony