Thank you both for your feedback.
I agree, ckcowl, I think 5" is huge -- and a LOT of money invested in the fabric! They asked us to bring over 4 yards just for the top! That would make a quilt that's 6' x 7'. I'm not making this quilt for the Jolly Green Giant. I think half that size should be more than sufficient for a nursery quilt ... especially after I add borders.
Workshop is tomorrow so we'll see how it turns out -- Mary Fons is our teacher. I had to grab a bunch of fabrics at the LQS just to be able to make something tomorrow. They're all shades of grey, but the designers are really mix-and-match. If I love it, I may make a second one in beautiful grey Kaffe Fassett fabrics (of course, since it's Kaffe, every single fabric has a little surprise of color mixed in with the neutrals). Such fun!
Thanks again for your feedback! You saved me a bundle of money at LQS.