So, here are some simple class/weapon suggestions
Engineer: Shovel, Pickaxe,Block,SMG,RPG
Engineer, plain and simple.
Rifleman: Pickaxe,Block,Semi,Grenade,Sticky Grenade
Standard rifleman type.
Assault:Pickaxe,Block,M4,Grenade,Flash Grenade
Standard assault-rushing class.
Heavy:Pickaxe,Block,M249,Grenade,Sticky Grenade
Heavy, eats his sandvich and fires M249.
Builder:Shovel,Pickaxe,Block,
Only needs 1/2 of the hits from the pickaxe and has infinite blocks.
Medic:Pickaxe,Block,SMG,Syringe,Medic Grenade
Syringe is simple healing tool,medic grenade heals ALL in its vicinity.

I also propose, all classes get a knife and a pistol. This would add a little more strategy to the game rather than rushing, sniping and camping.