How well would the self-leveling work if holes were placed in the bracing units?
What program did you use to create the part?
I've printed my first part, a tiny one, using the Fleks 3D plate. The magnets first wanted to lift the plate from the bed, after getting attracted to the head, but moving them to the three portions not approached by the head solved that. Tiny parts don't flex-pop free, but it was still relatively easy to remove.
The underside of the part came out perfectly smooth.