It's really great to see more up-close photos of the instrument!
What's very curious to me, is that Eddy Reynolds did in fact modify this instrument, however I don't see his classic blue floater board replacing the EQ section, so I'm wondering where the EQ modification is? The preamp appears to be nearly stock, save for a few Mallorys that were replaced. The preamp cover fits over the preamp board normally, so there wouldn't be anything on the underside of the preamp, otherwise it wouldn't be able to close (there's pretty low clearance there). That part is a mystery to me, in fact where the switch goes to is a mystery.
It has a 5-pin preamp and power amp connector similar to the later Janus-style Rhodes, so I'm wondering if there's something attached to the 5th pin by modification or if it's just a connection preference? Besides the bottom cabinet being from a later model Rhodes about '75 or '76, they definitely modified the piano after 1977 - the terminology "Preamp Out" and "Power Amp In" are the exact words used on the Janus amp design, so if Eddy did the power amp, he was basing it off the Janus model ins and outs.

I can't make it out exactly, but it appears the wood core hammer tip transition on the "Model E" is around C#, so that may be a couple notes lower than standard but not by much if so. I'd love to hear direct piano samples from George without any effects to hear a pure sound. A great piece of history.