In between sorting the bonnet & rear wings, I’ve flatted back my front ait damn mould a bit more, so it’s just about ready to start waxing up to take a mould. It’s taken quite a bit of effort to salvage that from my impatience!
I have some significant gaping holes in the car. I cut away the complete passenger side floor, to make way for the exhaust. I have reinstated the bulkhead, but a floor is required to separate the exhaust from the cabin, so I’ve made a simple lightweight frame over the exhaust. The heat shield will fit underneath the frame, something like below.

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A few tags need welding on to attach the heat shield and I need to provide some heat shielding for the wiring & battery along the transmission tunnel, but the basic part is in place.
This will then also support the floor, so that when someone (me?) inevitably leans on it, it doesn’t collapse. I’m possibly still going to use the inner skin from the boot lid, although, it may yet be simpler & lighter to make up something to fit the space, rather than trying to modify this:

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A bit of boxing in around the tailpipe is required, there's more to come with the door mods here, so that the exhaust gasses are not drawn in to the cabin. However, this new exhaust tunnel / double floor (there will be a flat floor across the bottom of the chassis rails) will be open to the back of the car, so air flow from the coolant radiator will hopefully been drawn through by the low pressure at the back of the car & also help cool everything - except me in the drivers seat! This is similar to waht we did on Big Bob, although the heat shield was added in after the first run, where burn marks appeared on the floor...
How many extra horsepower can you get by emulating Fred Flintsone? Let’s try:

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The drivers side foot well has been half attached for ages, I’ve just not got around to sorting it. When I’ve tried the brake & throttle pedals, one of the ridges in the original floor is just in the wrong place to allow a smooth transition between the pedals, I kept catching my heel on it. This along with wanting to flat floor the car underside, has made me decide to chop out the original floor. Rather than try to get it fitting back around the edges, where it had been cut by a previous owner, I’ve started again. However, I’m going to put a steel section in to give my feet more protection. This car will eventually be running quite low and I fancy affording my feet a little more protection. It’s a bit more weight , but it’s low down and there for a reason. I started my new steel panel, but it will take a little more sorting yet. This is also a similar solution to Bib Bob, which was also flat floored.