Well, I had to come up with something. =p
Now I'm working on making Tank-bustas.
Killa-kans come with a rokkit-launcha; I stole them from my kans, cut and filed them down to just rokkits, and glued them to the end of a twin-linked shoota to give me a hand held rokkit launcha. I'm also taking the mace from the
40k ork box set, cutting off the spiky ends, and fitting those to the end of sluggas to make rokkit pistols. Something to give my tank bustas some kick.