I just receive this link in a Wood Magazine e-Newsletter. Maybe it will be of some planning help;
https://www.woodmagazine.com/woodworking-plans/shop-organization/shop-layout-grid-and-tool-templates
By the way, my shop is the size of a one car garage, around 20' x 15.5', heated and cooled, attached toilet, refrig and computer nearby, and I am very happy with it. Nice if it was bigger so I didn't have to move tool around to do what I want to do, but I'll take it,,, well I have for 38 years. I have built a 17' kayak and a 12' sailboat hull in it. May have had to open the bathroom door at one end and the back exterior door at the other end, to plane and rip the stringers and gunwales.