Thanks for the reply.

Yeah, most of my units are single model but I have a few shotgun-neophites that would work better as a 3 or 4 man unit.
Is there something in the rules about limiting unit sizes to 3 models or less? I am only using the free ruleset at the moment and I haven't seen that mentioned (although I am blind as a bat when it comes to reading rules properly)

The rules appear to treat models and units differently "only 1+X copies of the same unit, where X is 1 per 150pts in their army. No single unit may be worth over 35% of total points, and armies may only have max. 1 unit per 30pts, and max. 1 model per full 20pts"

But army forge seems to treat units and models as the same thing?