I don't know anything about Jimis wah.. in fact, his roadies needed to replace them quite frequently.. so I wouldn't doubt there were many floating around at the time of his departure.
I do remember Stevie being proud as punch, (no digital modelers in those days) talking about how he had been experiementing using TWO wahs at the same time.. one up and one down and vice versa.. sitting on a stool.. in the studio..
Kinda cracks me up..
The first CS I ever purchased was a SRV CD.. he kind of was at the tail end of one technology, and heading in the front door of another era..
Fun stuff