Tshirt quilts are pretty heavy on their own then adding the bulk of Minky it wil be a pretty ( meaty) quilt. I recommend doing some practicing before working on the real quilt. Put together some practice squares with tshirt fabric ( with stabilizer if you used it) and Minky. - with & without batting so you can try all options out, quilt & see how it goes. You may have to fiddle with tensions, threads & needles-- best to work out those things before working on the real quilt- it's a pain to have to unquilt Minky due to tension problems, skipped stitches, etc.