It's a workout finding room for this stuff in a smallish car. Wayno
I got in your car Wayno , what shocked me was that the inside was so big that the weather was different on one side t'other.
Trent , when you get to running the car there is also the risk of "grey-outs" if you can't get your helmet into a position where it isn't pressed against the padding, that abrupt angle of your bro's neck would be better if there was a bit of curve at the top allowing the shoulders to come forward a little and the neck to be straighter....Yeah I know you are just mocking things up, but these are observations from someone who has done what you are doing.There will be room behind the drivers beltline and under the knees for bottles if you have no room in the engine bay.
Do you intend the cross section of the car to be round?..if so there will be room on either side of the driver's seat, ours are there...we have punch buttons on the end of them, which in the event of a fire you have to hit with your elbows, not ideal but when the wrist straps are on there aren't many places in the cab you can reach.
At this point of your build it is tempting to try and demarcate things, "THIS is the firewall" as a big flat barrier, better use of space likely means it will NOT be flat.......we had the luxury of CAD but when it comes down to the real nitty gritty you'll be putting things together and taking them apart ten times for every time you have a hot dinner, we did.We also had the ability to print out life size drawings of the hoops, then we could inch up on the bends, that was very handy.
And, once again. When you are making critical decisions about width and driver fit, wear thick clothes, right now you're agile, fighting weight and have good abdominal strength(just guessing, you're still in your 30's and you ride a bike)...........that doesn't mean you will when the car gets scrutineered for the first time. I could always get out easily in four seconds without my gear on , safety gear nearly doubled it, with my new triple layer suit and my new 30lbs it's in the 12 second range.
We refused to stretch our tank because we liked the lines, that made for a huge amount of work in the cramming.......longer cars are harder to transport, but that's about the only negative.......