Meanwhile, I have another challenge:
Crazy 8: A0;Save 100% using 7 builders (the level gives you 8).
Well, be it 6 or 7, the challenge has now been superceded:
Crazy 8: Save 100% using 4 builders (the level gives you 7)
This is a glitch-free solution.
The key saving comes from the following fact, which sounds rather unbelievable but is absolutely true: after you get past the "swamp" LemSteven alluded to, there exist a position reachable via just 2 builders, which allows you to bash thru the "cactus" left of the exit without over-bashing past the exit. You would not expect the basher to stop bashing at where it stops, but it does.
Naturally, that position needs to be pixel-precise both horizontally and vertically. It will turn out you don't need to start bashing off from a build brick (in fact, you shouldn't). That should help limit the number of places to try, for those who want to discover it themselves.
Screenshots are available, although again, it might be hard to believe without seeing it in action yourself.
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Aside: the screenshot in the Lemmings Solution pages for Crazy 8 is inaccurate near the exit area. The screenshot has a very narrow and somewhat deep pit left of the exit which doesn't exist in the actual level.