That is very similar to the basting frame I'm planning on making. Only difference is my top 4 boards are just 1x2's and I'm going to staple twill tape to them to baste the outer edges of the fabric to it. it's held together wtih c-clamps. My best friend in Missouri had one in her quilt shop and we would attach a quilt and could baste it in a couple of hours.
We didn't bother rolling it up.. just stitched half way across and your counterpart across from you would finish the row.
then you turn around and go back and she would finish that row.