I've got the Phlipphap (sp) bag pattern but think it is a bit more than I want to do too so am trying to figure out my own. I figure you take the measurements of your machine, add allowance for padding (I have some compressed foam from a sleeping bag mat to use for shock absorbtion), zipper, etc. Can't be any more difficult than a project bag. Also might want to add an outer pocket for accessories ---battery pack, charger, external drive. I'm leaning toward using a prequilted fabric for lining and vamping the heck out of whatever I use for the outer fabric. i.e. embroidery or applique on a pieced background or even a whole cloth one. Or I may just take the carrier I purchased and cover it with my fabric. Possibilities abound.