I'm more pleased to have found this easy kitbash than with my painting
Every time a plague claw is assembled, it leaves behind the end of a warp lightning cannon
The Tesla cannon is one of the options on this inexpensive model here:-
https://www.zinge.co.uk/collections/artillery/products/steampunk-gun-on-a-gun-carriage-various?variant=23530571015
I think it works nicely with the warp lightning cannon because it also has 3 of everything: 3 dynamos, 3 three switches on each of the two control consoles. Like the Warp lightning cannon has three power cables and three lights
The technology is the wrong era, but
GW already seem to be pushing that envelope. Gatling guns were 1861, Braun tubes were 1922. And Tesla Coils (obviously never weaponized) were sometime inbetween - so there's only 60 years in it
And I don't like how the current warp lightning cannon just has a chunk of warpstone at each end instead of any believable machinery. It reminds me of those airport bomb detectors that were sold all around the world by fraudsters - that were really just two tv aerials stuck on the top of a supermarket barcode reader.