I finished this unit up the other day. I converted the standard bearer to hold the standard from the Island of Blood guy's back. I just cut out the handle on the old one and replaced it with a matching cut on the new. It's not perfect but it was quick and I think it looks pretty good.
Look, the drum is a ginger!
I decided not to rust their weapons because I figured Stormvermin would be more likely to take care of them.
Getting these guys to rank up is a challenge. They've got shields, tails and halberds. My solution is to use my ersatz Stormvermin to help not take up so much space. I took the Island of Blood clanrats that have helmets and armor and am painting them up like Stormvermin. They're considerably smaller and far less detailed but the idea is to intersperse them in a normal Stormvermin unit so they help it rank up. Plus a Stormvermin box is like $50 and IoB clanrats are cheap. I'm going to use some plasticard to beef up their spears so they look more like halberds (though in WHFB the aesthetic difference between spears and halberds is not entirely clear). If anyone raises an issue I'll just say that they're juvenile Stormvermin that are replacing previous casualties.