Both the HoneyBadger and West3D buildsheets I have are 305mm square. I have an OSEQ that is 310, so i'll probably be updating this at some point. 

This uses the bottom pieces from the original, you might try scaling them to 100.5% or so, as I have one that falls off every few weeks. Not too bad, you could glue it if you only use one size sheet.

I have a remix of this model that is held together with a 3mm screw.