Well, it kind of resembles the Mad Cat Mk III, so if nothing else you could always start there. I'd consider maybe getting an arm from the Enforcer (same arm & same AC size). You may just have to live with the larger LRM launcher on the right shoulder, but for the left shoulder SRM-6 you could use the SRM launcher from the WHM-4L Warhammer or the newsculpt Wolverine (just turn them on their sides).
Hardest is going to be the left arm, since the Mad Cat Mk III doesn't have hands. Truth be told, the left hand in the artwork reminds me of the one on my OSR-2L Ostroc, so that might work.
Going to be an expensive kitbash, though, essentially buying 4 minis (5 if you can find a decent box-shaped LRM-10) just to build a Talos, although I have a soft spot for any Taurian design...