Okay, I'm really confused now. You say they're QST but the design is HST? I can see that the center, if you made that first, could be made as 4 HST's put together, but then you would have to add the corner pieces. It would be much easier (IMHO) to make each corner unit as QST's and then put the 4 of them together.
EQ should give you all the cutting information, but I'm not sure how it looks at this particular block.