My first fully built unit is my Grundstock Thunderers.
These guys were a rough kitbash from the 40k poxwalker models and the weapon components from the Thunderers set. I think they have a bit of a Davy Jones crew feel to them with all the tentacles and bits.
I still have most of the rifles remaining so will hopefully get round to building 4 more at a future point. Since the GH2017 has made the rifles a good choice I am just weighing up wether I want to do the remaining as my pox guys or add them to a different race.