I have just found out that there is a typo in my pattern for ATLANTIS in Aust Patchwork & Quilting Magazine Volume 17 No 6 Summer Special. Somewhere between the final version and the printer - the 1/4in seam allowance turned into 1/2in. AP&Q are very sorry for this. All measurements in the pattern are correct for 1/4in seam.
I will contact everyone who has bought a kit from me but if you are thinking about doing it from the magazine please make sure you are aware of it.