The Battlewagon has two places in back for gunners and I made the front two doors into gunner spots with the addition of a little plasticard. That gives me emplacements for 4 gunners and the turret. That is all the extra Rokkit/Big Shootas that the Battlewagon will allow.
I tried to make each of minis unique. I have wanted to do a "screaming two-handed Big Shoota" mini for a while now. While building him, I realized that no one, not even an Ork, could shoot a gun like that unsupported. That is not an issue when he can brace the gun on the side of the Battlewagon's side armor. If this mini was on foot, he would look silly and unrealistic. Normally, I am a fan of "silly and unrealistic" in my Ork army but the mini's pose looked stupid and that is never good. To avoid this stupidity, I magnetized a bipod for him.
These minis cost me maybe $15 in bits and $20 for the painting. The converting is worth maybe $5. Total trade/replacement value is $40.