So, Randall didn't do the elevator, nor did he cover the Tsiolkovsky butter equation issue.
No reason we cannot.
We have 100,000 km of stairs to climb. We have a backpack and a large supply of butter and water at the base of the tower.
To start with, assume calories burned is 2000/day plus Weight*X / m for some constant X. This means we can "climb cheaper" at lower gravity, at least on the way up.
How much cheaper is it to descend than ascend? Past the half way point we run into problems, as we are now going "down". We can punt by simply calculating the requirements to the 50,000 km spot (half way) at least as an initial pass.
We clearly cannot carry all the food required to reach 50,000 km on our back. And with stairs, dragging it is impractical.
With a fast google, I find that at least one hiker limits themselves to 30% of their body mass in supplies. https://answers.yahoo.com/question/inde ... 315AAFDNJl
That is a nice round number.
Bah - we need the cost to go down hill to work out how to go up, as we need to go up with supplies, set up the cache, then come back down without starving.