I believe a MOD will need to change your threads location. What I did. I bought 20 games work shop zombies, then took all the spare legs arms heads. A few spare empire bits. After some clever basing, made another 20 coming up out of the ground. Thus giving me 40 for the price of 20. I had extra 20mm bases. Also if you haven't yet play test your 100 zombies try it to see if you actually like using them. Some folks bring none, and do well. Others bring tons and also do well.