Of course they didn't give them a tank! You don't need an Axlotl Tank to make a clone, I suspect that the knowledge given to Ix by the Tleilaxu was how to make a negative of Malky's genes. That was all they needed.
With Tleilax tech and Ixian marketing skills think of the possibilities! It would revolutionize the chicken nugget and the fast food industry. One tank for every franchise.
I've wondered about that passage, why it's necessary for the Tleilax to be involved, cloning is simple stuff. A couple techs, a few hundred 'advisors', meaning a special forces assault troops, and you're good to go. I guess because it involves ultimate forms of good and evil, etc, you have to find a specialist..
make a negative of Malky's genes
That's kind of funny too. I've got to remember to ask a geneticist. 'Say you've got a really good sheep and you want a really bad sheep. You can just reverse it's gene flow right?' You get a similar idea in The Jesus Incident I think, you've got The Ship, God, so he has to have the Devil for some reason so at the end there's the revelation. The geneticist Lewis was Satan. It should be a big deal, it could be a major plot point, but I'm pretty sure Lewis starts laughing and disappears. I haven't read those in a while. I remember really enjoying them when I was younger but some of my memories make me cringe a bit. Should probably re-read them anyway Frank's take on religion is worth it. Flattery was a decent character. The villain of Destination:Void gets upgraded to Doubting Thomas in the Garden of Eden. And the psychedelic floating mushroom spore hot air balloons. Now I remember why I liked those books..
Would creating Malky involve gene something something? Or are evil people run of the mill but creating a really good person you've got to do some high level genetic manipulation? Maybe a few thousand years back, when the Ixians started down this path, they consulted the Tleilax and got the info they needed on good/evil archetypes, breeding, cloning, and gene manipulation. Then they started their breeding program free of Tleilax interference? It's ambiguous. Good/evil is wrong in the first place, all they need is to select for empathy. Which brings back the question how is Malky evil? We might be taking this stuff too literal..