"No, we've done eight of those repeatedly, and these all work together pretty smoothly. Several were in the initial data dump we got from the benefactors, though we developed all the not-strictly-cardiac variants ourselves in order to provide more options. The capsules, centrifuge, and thrombocyte maker, in your case."

"Those all seem good. I can look back at the flight heart if I get very enamored of wings, I guess. Right, what's next... sensory again. Actually, how well does the microscopic vision, the tapetum lucidum mirrors, work if I try to integrate it with the complex eyes I already asked for? Or if I have one eye with telescoping capacity and expanded spectrum, and the other microscopic?"

"Not well, and it's been tried. If you weren't bearing such a heavy load of cognitive changes I'd suggest you pilot the spectrum-microscope combination. The best I've seen so far is to implant the microscopic eyes on one or both palms. That would bring you up to thirteen, so I'd advise strongly against adding more than one more."

"...Drop the side eyes to 'penciled in', I think. And we can move on to lungs."

"Noted. For disguise purposes, you want to consider the vox celestial; mimic just about any sound, but with dizziness likely to result for much of the range. It's one of the reasons we've worked hard on the balance enhancement, Grayson's organ, that seems to negate the side effects."

"Five to eighty thousand Hertz range. Mostly causing dizziness at the ends below and above human hearing?"

"Or very high volume within it."

"I'll take it, and practice to deal with the drawbacks. I think there will be plenty of opportunities, though my coworkers might not thank you for letting me try."

"As long as they're not a serious impediment to work."

"I'll tone it down if it becomes a problem. If I want multiple lung types, I'll need the circulators?"

"Yes. We're working on three at a time, but that version of the circulator isn't ready for testing yet."

"Only four kinds, is there much demand?"

"Well, we also have two experimental new types. One which could handle Venusian atmosphere other than the temperature, and one which stores oxygen and captures CO2 as a cyanide compound you can cough up as fluid and release as gas."

"...I think I'll pass on the cyanide, even if I'd be immune. Let's take the circulator and the heat and athlete lungs. Emergency backup, the atmospheric filter, and the detoxifier annex. And pencil throat sealer as well, I think I have quite a few extra spaces left in my extra couple years of treatments."

"Don't see any problems there. Digestion?"

"Sure. Not much that jumped out at me, here. The super-digestion intestine. It seems like it would be easier to put that alongside the normal digestive tract rather than replace it."

"We haven't tried it. There's an experimental secondary tract, but it's for extracting and digesting inorganics."

"Oh, that's interesting... I probably won't be a good test case, though, unless I swear off interesting psychoactives, which I very much prefer not to do."

"Are many of those inorganic-based? I think it would be fine."

"Alright, sure, add the secondary gut. And the fangs, that's a solid enough holdout weapon I think I want that."

"The other experiment currently running is a biological furnace which burns indigestible organics and converts it to electricity and then fat and protein."

"No issues with body temperature?"

"Minimal. It does vent smoke from your ears if you run it too long."

"...Pass. Too Looney Tunes. I think change the jaw to go with the fangs - they'll be up to the pressure?"

"Most likely. If you take a normal amount of skeletal enhancements, absolutely."