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Realizing what you've done wrong and feeling the pain of figuring out how to amend it is the whole point of the exercise. Maybe the right way to amend it is to rewrite the whole thing, but that may or may not be the best choice, depending on what else you want to get done. Just like the real world!

A rewrite could always be an option, if it's finished on time.

Setting a reasonable pace with the project could be tricky, but I think it would be very beneficial.

Most of the time, you should be building an initial version and throwing it away anyway.

Internet time does not justify poor program design.