Loki:
Like the sound of what you have got planned for the army, for the fuel tank for the flammer, i belive that there is a barrel on the dwarf cannon sprue that would work well, it has a little nozzle coming out of one end which you could attached the fuel pipe to and it had a dwarfs sign on it as well so should work well.
I am pleased to hear that you including death rockets they are one of my favorite CD units ,for my death rockets i have used the empire hell storm battery, and the forge world grot bomb check out the link for them on my army blog https://discourse.chaos-dwarfs.com/t/9189 the grot bomb is on page 5 and the hell storm is on page 2.
There are loads of great conversions that people have done for them try checking out this link http://www.chaos-dwarfs.com/forum/showthread.php?tid=2456
there is nothing wrong with having the army mainly red it works really well
also great work on the latest finished warriors keep this great stuff coming :hat off