It looks like the front bay is intended to have panels on the non-diagonalized areas.
The vertical tube at the front of the rocker areas really needs more transverse rigidity.
On the ERA. the relays and circuit breakers are mounted on a bracket on the "passenger-side" front firewall. Hence, much of the dash harness is mirrored between LHD and RHD versions.
We install a couple EWP pumps about 20 years ago. I have the original box, but it has no model markings. I wouldn't be surprised that there was only one available back then and it was probably similar to the EWP130. It worked fine with a 400 bhp 331.
I don't know RCR's configuration for the brake reservoirs, but you only need the residual check valves if the reservoirs are below the level of the calipers and master cylinders. Otherwise, the normal fluid head pressure will keep the air out of the system and keep the pads from abnormally...
That thing better be gold plated. There are many good ones available for under $200. Some of them might call themselves "backup camera" but they work just like rear view mirrors.
Interesting, but
"Easy to program the level of any tank and electronic gauge - does not work with OE style gauges that utilize an ohm only input."
Someone will have to try it with Smiths.