Just realised I forgot to post up that list of parts I used - in case it's of any use.
I'm not unhappy with my higher spec unit - but I don't get the best out of it - Kenwood DDX9017DABS
It's been over 6 months and so far I haven't put any time into properly learning it.
Despite being supposedly technically minded - I have found Android Auto to be a nuisance - from having to plug the cable in - which also means lots of part charges of the battery which will break that down early - to my auto elec insisting on connecting it to the handbrake which now means it tells me when it wants to operate - to most of my music not having correct tags so most of the available music players don't correctly index it and I can't find what I want while driving - I find I just keep using Bluetooth for connecting including music.
Also the screen is much harder to see than the phone screen in sunlight - so it's easier to just keep using the phone for Google Maps navigation.
Parts list for a 2010 T5;
Kenwood DDX-9017DABS Car Multimedia + CMOS-130 Reverse Cam &Kenwood DRV-N520 Dash Camera
Kenwood Universal Patch Harness CHVW3C $99.00
Aerpro Kenwood / JVC to ISO AV Wiring Harness - APP8KE4 $13.85 1 $13.85
STINGER ST27AA25 2xFakra Amplified Antenna Adaptor - ANTENNA $30.00 1 0 $30.00
ADAPTER
STINGER_MT999011_05-Up Volkswagen Dash Kit (DD & SD) $60.00 1 0 $60.00
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VW Transporter T5 MY10 Van M 6spd 2.0DT 103kw White. Long wheel base. Standard roof?
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