For those interested I’ve posted an update to the original file on Thingiverse which includes some accessory clips. The most important one is a clip that sits in between the two wall magnets and slides into the floor piece (the attached images should hopefully explain better). This helps support that connection which tended to be the weakest given the greater leverage on that joint. With them I could make structures that are surprisingly sturdy while still being quick to take apart and reconfigure, all without having to worry about the polarity of the magnets. The “double connectors” for the floor pieces are only necessary if you’re making really large structures with unsupported floors.