Starshine up hug, hugshine down.  And happy birthdays!  Some of them slightly belated.

Uh, what does that... mean?

Traditional greeting, and then also today you turned thirty-five, yesterday ten, and four days ago one.  From the point of view of certain other flows of time.

...what other flows of time?

Don't worry about it.  For the record I'm sincerely sorry that my main purpose in death is to make jokes that go over your head; it's very rude I know.  You can have a present to make up for it, though, if you want.  In addition to the answers you came up here for.  Which should possibly be given first.

...do you already psychically know my questions or should I spell them out?

How about we start with the spelling.

What should I expect if I attempt to install elevators at the edge of the cylinder to allow settlement of the existing top handful of caverns, and what should I expect if those caverns are later expanded by mechanical or magical means, especially in terms of whether there'll be a cave-in?

An important thing to remember - or learn, rather - is that because the line which twenty-nine thirty-fourths of the people in this conversation are sitting on top of is infinite, it's hanging, not resting, and so the stress involved is somewhat less than you might imagine.  But to actually answer your question, you can expect decreased relations with most governments and increased relations with some portion of their populaces.  Also it'll look super cool.

Anything nonobvious I should know about how I will tick off governments?

Not that I can see although I can't in fact see everything.

What can you see, besides my - alternate timestream birthdays?

Is that a request to move the conversation on to your present?

Not necessarily, if there's more to know about Project Elevator.

The very top caverns are going to be way too cold; make sure you visit anywhere you're planning to remodel well ahead of time to check for things like that.  Install really good guardrails very liberally.  Probably you could hire locals to run a shuttle service in addition to the elevators and nothing would particularly go wrong with that.

Can I install chiplock computers in the locals without issue? It's possible to pilot a shuttle without but way easier with.

Ha!  No, definitely not, your food barely worked for people here, chiplocks for sure won't.  Fun fact there was totally a brief alternate timestream moment where you almost killed Jordan with the chocolate basket.  But - and this is me using my basic guessing ability rather than my otherworldly sight - you could probably hire some autumn and winter solqs and set them to it and given enough arbitrary materials and volunteers and resurrections they just might manage it.

...I'm glad I did not almost kill Jordan with the chocolate basket. Are there any foods that will harm people that I might otherwise make naively?

I don't think you'll do any immediate harm but locals need a lot higher proportion of quote natural unquote foods and are generally a little more nutritionally delicate than the ones you're used to, if you end up feeding anyone long-term.

Okay, so more with the fruit salad and less with the pop tarts?

You've got the idea.

Am I looking at anything I won't expect in terms of embedding stuff in the outside of the cylinder rock? What kind of rock is it? Will I be looking at anything weird in terms of airflow or lighting that I won't notice by visiting?

It's not just one kind of rock, and it's not only rock.  Gravity applies to sun- and moonlight on a celestial scale but it shouldn't be too inconvenient.  Airflow ought to be fine although the terminology might throw you off.

Besides 'malaria'?

Well, we could hardly call it the atmosphere.