Originally Posted by AngelinaMaria
Can I size everything down by 1/4 inch and have it still work out??
Since it's essentially a 9 patch, you're probably better off shaving the 1/4" off each section. Otherwise, you have to deal with x/16's measurements.
If you make it a 11.25" FINISHED block, then the center and corner squares need to be cut 4.25" UNFINISHED.
The starting squares to make the QST blocks are cut 5".
I'm usually from the cut-oversize-and-trim-down school but that's the exact size needed, so you need to be spot on in the cutting and sewing.
You could take a slightly smaller seam allowance when sewing on either side of the diagonal line.
That would give you a little wiggle room.
Make the QST blocks and trim down to 4.25" UNFINISHED.
When assembled, you should have a 11.75" UNFINISHED block.