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"I am a high school student interested in building"
It's rude to call you a school boy when you proclaim yourself to be a school boy???

"I thought the whole point of the RepRap community was to push the limits on what machines can be made, without spending a ton of money."
You missed the point by a wide margin. Reprap is about rapidly self replicating machines, hence the 'rep' part of the term.

Your solution to swap connectors between boards is... frankly very dumb when it can be done on one board and done in software.

I'll say, you have high in the sky dreams, little knowledge and much hubris about you. Take a step back for a second and realize that you're not inventing the wheel here; you're renting a wheel and calling it a new invention.