Crane, IchoTolot, Minim, Armani - all of you have done well with with achieving intended solutions to my levels (CAUTION Open Pit is a fairly open-ended level anyway, excuse the pun). Good work and thanks for checking them out!
I'd like to attach my replays to this very post here as well.
While I'm at it, it does seem like I've solved Highland Fling with exactly 5 builders (prior to me even reading about your challenge), yayz