As luck would have it, some of the recent Curious Constructs artillery crew figures fit in quite well as Heavy Stubber gunners.
Now I know that the Stormlord doesn't necessarily have an attached platoon but I'm considering painting some Praetorians up in a different scheme. At the moment I'm tempted to go with a black uniform with a white or silver trim, kind of Lancers inspired. We'll see how it goes.
Unfortunately, due to the exigencies of the dreaded 'work' word, there probably won't be any updates or progress during March.