Hey ladies there is a thread here on the quilting board that a members husband made her one my husband made one for me and it cost $12 to make here is the link to make it I guess you can do at least a full quilt on one We just made mine and I only do walls and baby quilts so it works for me I have found you need a table that your sewing machine sets down into.
http://www.quiltingboard.com/t-24223-1.htm