I love quilters! We can sew anywhere and do it well... go for it.. I know quilters who have converted sheds and have even built their own little houses for their quilting needs..! We are amazing .. If you have to hang the drywall get those kids to help explain to them that you will be happier and that leads to a happier home.. :) So my advice for what it is worth ... GO FOR IT!! Happy Quilting!
Hugs
Quiltinmama
ps send pics of the garage during and after renovations!