Here's the finished project. Double USB adaptor fitted (right hand side) the other is a double USB charger using cigarette lighter.
Splash screen is easy just make sure you use correct format & size. Also on the headunit i fitted you can only use the USB 1 input to uplaod picture. Other headunits may be different you just need to check.
Next project I'm going to replace rear Bose speakers (currently not working) but use the actual unit and wire them via a 4 channel Amp.
Hope all goes well for you.
