You can't be afraid to make mistakes on a quilt like this, especially because of the size. When you have to match the sides or the bottom to extend it, because you don't have a larger design board. I think mine is sufficient for most of what I do but not for a charm quilt, if I want to make it bigger.
Because I work in rows of six across and down, (I call that a block) I can fix a mistake real quick in that small area. I sewed a few patches wrong within a block I was working on last night and it was not big deal to rip and fix.
Now, I am looking at all the extra 2.5 squares that will be left over, and guess what? I will make a spool quilt out of those, so another charm will be coming up, that is after I make 100 pickled clamshells from my other thread, lol.