I'm a first-time poster who has been lurking and learning from you all for over a year now. I am currently slowly turning a portion of an existing storage shed into a workshop. the shop will be 24' x 20' with provisions for an external dust collection, compressor room and possibly a 10' x 10' finish room. Because it had a dirt floor I took the opportunity to form a service chase through the centre of the shop. It is 12" x 12" and will allow me to run 220v, 110v and a dust collection main to my major tools. Dust collection for secondary tools will all run along the walls.