I played a lot of 2e GW, and loved 3e. The Techno Knight on an armored mutated feline, on the 3e GW is a classic piece of TSR artwork.
7e GW, while I appreciated, how quickly one could jump into the game, felt like a one shot style game, not something that would sustain a long campaign.
Arcana of the Ancients, a Monte Cook Games product could serve as the basis of a 5e based set of rules for GW. It covers mutations and has hundreds of Techno-Magic...and for 7e GW lovers is partially written by Bruce Cordel.