What about making the garage door a design wall. Heavy magnets could hang sheet of flannel for design wall. I have something similar. Painted walls and added shelving along one wall for fabrics over base of cabinets and counter top. Went to restore and found great kitchen cabinets and great counter top placed over cabinets. Spent very little money except for coated wire shelving which are adjustable the base cabinets are finished and counter so heavy did not have to be attached to cabinets. Placed 2 smaller cabinets in middle of room and topped with finished flush door for sewing table. Door knob hole makes perfect place for machine cord. It is amazing what re-stores have and very inexpensive. Good luck and post pictures