I'm thinking of picking up the ErgoDox kit from the current Massdrop. How easy is it in general to get custom caps for the vertical keys? Will regular 1.5x keys rotated 90 degrees (1) fit, and (2) look and feel "normal"?
The Egdx is designed around customiz-ability, programmability and easy layer access.
Typically people buy -printed- keycap sets to fit the standard qwerty layout which we already know is inferior and suboptimal..
I don't quite understand what you mean here---what exactly is inferior, and what do you recommend?
The standard keyboard qwerty layout is an antiquated design left over from typewriter days..
I speak not only of the letter arrangement, but the general rectangular "shape" of the board as well..
Because of the close proximity of keys.. the left and right hand has to be brought together closely. causing users to either lift their shoulders, or compress their chest to get their arms so close in front of them..
because the keys are also @ unadjustable right angles.. most people also turn their wrists outwards steeply. they also have to rotate their wrist in wards to equalize the travel distance between fingers and keys.
Some of this can be overcome with technique and modifying/ widening the key layout..
But ultimately the wrist and shoulder problems can not be alleviated...
The continued pursuit of the flat rectangular keyboard is some what of an antiquated tradition, rather than maximizing utility..
Whenever people say something like, this keyboard is so awesome, or wow, topre sturdy, all they're really saying is Yay, I spent money today...
In truth they've done NOTHING to improve their actual keyboard experience...

The other side of this is... Many people don't actually NEED a better keyboard, because they don't actually use the computer enough...
If that is the case... then it really wouldn't hurt them to use the standard board.
But then, if we carry this logic further.. why did they need a mechanical keyboard AT ALL....
Well... now we're back to the consumerist debate, where one's locked into materialism..
Which is a corruption of keyboard innovation...
They've fallen pray to keyboard vanity.. similar to women's high-heels... completely idiotic devices... reducing productivity...