Chief is pretty solid with the points.
I'd combine the 2 units into a 35 with full command.
You save the points from the 2nd command and 5 rats then, plus the weapons team.
Use those points for a large block of slaves to throw the engineer into.
You want 2 units with atleast 35 bodies in each.
Personally, i would also take 1-2 units of giant rats.
Minimum sized only for blocking any charges and acting as bait or a small shield.
Wont last long, but buys you a turn if needed, so well worth the points.
With the weapons teams, i usually prefer the warpfire thrower over the mortar as i have found the damage output and use is far greater.
Playing at smaller points you will be on a smaller board aswell, meaning less range is needed.
Just my opinions though