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Hi Neil,
It looks very interesting, I would just like to note here that you'd probably want to add some more head room between both, the ceiling and the windshield.
The first one (ceiling is just for comfort... and taller people) BUT the second one is entirely for safety.
It's a very common omission from us DIYers to basically delete any free space we find. Just imagine that head room in a 40mph crash... remember everything inside the vehicle will keep moving the way it was - in a straight line - to the windshield 15 inches away.
There are a lot of handy physics calculators in the web that could help you determine the inertia/momentum that the person has at the moment of the impact. That way you can calculate then the speed of the head of the subject when it makes the semi-circular travel from the original position to the driving wheel due to the waist being held by the seatbelt.
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