>>6250541What do you mean by "fandom"? Like part of a fantasy/sci-fi background universe?
Westwind does a couple of resin spider tanks for their soviets.
Dust48 has walkers of which some have more than 4 legs.
Games Workshop has some "spider"-like vehicles/tanks for some of the Warhammer 40k factions.
None of these is super detailed, but in the end only yourself is the limit in terms of detail there.
Or just get some nice kits and start kitbashing/converting like pic related.