Wargames Factory have just released their heavy weapon teams which should fit in nicely with DT range as they are armoured with german gas-masked helmets. You get 8 men and 4 heavy weapon options - mortar, twin HMG, energy cannon and missile launcher. wargamesfactory.com/webstore/alien-suns/shock-troop-heavy-weapons-1
I'm thinking yoyr basic A2 5 man squad to include 2 heavy weapons and operators, 2 crew with pistol and a spotter commander with pistol. The twin MG's and energy canon stats can just be grabbed from the new releases and shouldn't be to difficult to make rules for mortars.