Originally Posted by
Austinite
I mentioned my plans to someone local and they started to tell me that it wasn't possible and to make another pattern. Don't see why you couldn't make large HSTs

Pffft! Of course you can make large HSTs - check out this tutorial where she uses 18" squares for HSTs.
http://www.incolororder.com/2011/08/...-tutorial.html
I think if you do huge HSTs, you don't have to worry as much about squaring them up. If I was making a quilt this way, I would probably use 14" squares (so that I could cut 3 from the width of fabric with little waste), then make them the way Jan described. I wouldn't bother with squaring up, though; on a 3" HST, being 1/8" off is a big deal. On a 14" HST, you can ease in that difference.
Do your big blocks, and have fun with it!
Edit: I agree, though: starch them first to minimize stretching.