ldwechsler wrote:For something that HAS to be a great secret, having it done on Manticore would probably be an unacceptable risk.
The lab work probably wasn't done on Manticore. That doesn't preclude it being done in the Manticore system. A ship with diplomatic immunity or lying doggo in the outer system would do fine for a secret lab location; if it is outside the hyper-limit it is almost interception proof and a self-destruct takes care of the possibility of capture anywhere.
A "news-corp" dispatch boat probably has enough space for the lab, even with a Streak Drive's space requirement. A tramp freighter outside the hyper-limit would even have room for all sorts of muscle memory training.
FWIW, it doesn't seem to me that the muscle-memory training can be done with the victim's DNA directly. The muscle memory training could be done by anyone, anywhere and passed off as rehearsals for a drama. The participants don't even need to know the target or any other part of the plan; "accidents" could be arranged if necessary.