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. if the next owner has other plans he can just cap the trench. It will be a slow, probably never-ending process but I am excited to get going on this project!