don't forget about picking up at least 1 heavy weapons squad box to start with as well!
you should be able to get at least 9 weapon teams out of that 1 box!
a) don't glue the rocket launcher arms to the bi-pod - just whack them onto a regular guardsman!
b) use the bi-pod for the mortars & glue them all onto their own separet bases. add 2 crewmen and presto! mortar support squad
c) use the tri-pod for any of the remaning weapons.
another neat trick;
- if you have lots of spares of the plastic chaos heavy bolter then use catachan arms and you can model a gardsman actually carriying it!
the arms you'll need are the right arm holding the lasgaun at ease by it's side & the left knife arm with the knife fully extended, thrusting out forwards.
cheers!