I think as you seem to know your vehicle well it is less of a risk. Taking loads of spares and the right tools is my approach - half the problem solved when you have all the right parts. You sound like you know your vehicle well and are well organised ;-)
Just accept that things might happen where you will be delayed whereas somebody in a landy for example could be sorted out within a few hours. And it might cost a lot to get parts specially flown in. It's not easy like people always say ("DHL is everywhere" etc) And much of the info on the web and things like Tracks4Africa are for Toyota/Landy's etc. These things help a lot - you will need to trail blaze at times to find solutions.
Personally I'd take a more commonly used overland vehicle as it will retain its resale value, much easier to sort things out, all the mods and extra bits are tried and tested and easy to buy - plus my landy was a real babe magnet! ;-p
PS: Space seems a bit limited for extra water and fuel and storage compared to a landy/toyota??
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