I don't have any pig iron figures I'm afraid, but that's a standard 25mm slottabase the early prototype figure is standing on in the painted photo.
Leaders & heavy weapons will definitely be happening if we can get the basic riflemen funded.
I've attached a preview of the squad sergeant arms for you (WIP, some more detail yet to be added).
Also on the "leaders" plan is a junior and senior officer, they'll go up as a squad of 5 figures* when the riflemen are funded, most likely at the £900 point.
* Set contents likely 3 sergeants, 1 junior officer, 1 senior officer, cost the same price as the riflemen.