I've got a box of Clanrats and a box of Night Runners and the style are incompatible i.e. the older Night Runners are a lot chunkier, so I can't modify the Clanrats to have Night Runner left arm. I've looked on some Bits sites and it seems like my options are Stormvermin and Plague Monks. Am I right in thinking that the Plague Monks are also an old design, as the images look like they may also be a bit chunky? Any ideas on what would be the best option, or any other suggestions?
EDIT: also, do the Stormvermin bodies come in two parts that need to be glued together i.e. the front and back, with one leg on each?