Looking at the bits above, the set contains 8 Veer-myn Night Crawlers (2 variants), 1 Veer-myn Exterminator (with Chem Thrower special weapon) and 1 Veer-myn Master (Master Reekish).
It's fairly straight forward assembling the set. There is a corresponding body, head, arms and tails for each of the two Night Crawler variants - if you put the wrong head onto the wrong body, then it just doesn't fit right (same with the arms and tails). The two special characters just use the leftover parts, and there's a choice about which head you give to the Master and Exterminator.
Pretty rainy this weekend, so I might have to wait another time before getting an undercoat on them!