There would actually be 3 rooms, a large sewing & design area, a fabric "Pantry" & a "wet" room for dyeing / painting fabric, the last would have a sink. There's be plenty of electric outlets. good lighting, plenty of storage & room to move around, plus french doors that lead to a small patio. This of course is my dream sewing space, my current is an 11' x 13' room that's crammed full of supplies, fabric & sewing machines. Good lighting & plenty of storage is a must. A design wall is a good option also. Good luck.
Cathy S/ Willowwind