I haven’t seen under the bonnet of a SDV6 either but I understand there to be an extra air box on the driver side where the TD6 has space for a compressor. I think you might struggle finding space for it.
The main battery is in the boot on the driver side. The 3rd row seats as well as the extra aircon unit in the boot on the passenger side may limit where to put a second, unless there is enough space to put it next to the main battery.
As for the roof rack, The Rhino option requires factory roof rails to be on the car. Did you specify these as they are an option (they were on the 2018 SE).
You mention the wheel size of an HSE, the SE standard has 19 inch wheels. Did you upgrade them to 20 inch wheels?
Ron
2016 D4 TDV6 Corris Grey
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2018 D5 TD6 SE Silicon Silver - gone
2011 D4 TDV6 2.7 Indus Silver - gone
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