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Since I imagine this project will take a while, I think it might be a good idea to wait for the imminent release of the Ork Codex. I too waffled in whether to use the Ork or Tyranid Codex for my Kroot Mercenaries, and although I ended up going an entirely direction with them, I originally used the ork Codex in 8th and had a lot of fun. Kommandos are pretty great generic kroot, Stormboyz are fantastic Vulturekin, as well as other easy conversions. I just don’t have as good an idea on how the Tyranid army functions to know the best way to convert there, and there’s no real Kroot equivalent/rationale for Synapse.

Either way, post photos when you get started!

Bonus for orks: more “mechanized” stuff. Do Nids have transports, etc.?