I am not doubting her ability to know her stuff, I am doubting her ability to slog through University. I am sure modern-Tsukiko can reanimate dead tissue with copious amounts of electricity and a good evil cackle. I doubt she can get a paper saying that she is qualified for the job. In modern times, that means that you don't get the job, even if you are eminently qualified for it. Now, it is true she could choose to buy herself a labcoat and go into business on her own, and I suppose in a modern fantasy setting à la Shadowrun she might get funding from less-than-legal sources that might get her enough cash to fund a full lab. That said, it still doesn't feel right to me; maybe is her motherly attitude towards her undead, I just can't picture her as a rubber gloves-and-labcoat kind of person.
Oh, all the others I had absolutely no issues with - excellent re-imaginings. About the only thing is that maybe Roy's weapon should be a bit behind the times, to indicate it is a family heirloom - maybe an old six-shooter? But then, for all I know weapons the rifle you gave him is already an old style Winchester, and I just can't tell.
Grey Wolf