Starting a dedicated forum for hobby workshops is a great idea. I've recently built my workshop and I'm still looking for the best way to finish the inside, choose the final layout, what best kind of sink to use etc.
I recently moved to a property that allowed me to build pretty much anything I want as long as it is no bigger than 35 square meters or wider than 4.8m (that's around 370 square feet and no more than about 15 ft wide).
The building on the photo below is the result. It is 20m from my house and now that we're in a middle of winter I wish I thought about some sort of covered walkway like one of the posters above did
It is still being built on the photo below. Currently the weather is quite bad (mist with the sun behind the building) that a photo would not come out properly. The size is 4.8x7m and it is so tall so I can have an upper floor over the front half of it. There is also large garage-style sliding door on the other side and 1.6m deck I'll build shelves for storing raw materials on the back. This is why the roof extends behind the back of the building. It is insulated and still not fully painted on the outside.
If I could do things differently I would choose a contractor who knew what he was doing... As I ended up trusting a guy who was building it and I only started checking his construction techniques when it was too late. There are no dangerous issues with the construction, but one of the things that should be done differently is the way it was insulated.I now have water condensation issues due to inadequate venting between the outside membrane and the cladding so I'll be adding plastic vents etc. Also the bits of the wall at the very bottom were lacking a way to prevent water ingress there when it rains and there is high wind at the same time. Basically it is now over 3 months since it was "finished" and despite having to put in a lot of work I still have to deal with few small issues.
Regardless of the above I enjoy it a lot. I have a 2ton WMW (Heckert) FW220 milling machine there and other smaller machines and tools I could never fit in my previous shed-shop you can see a bit of in the background (it is 3x4m).
I have 3 phase power here (40 amps each phase or 28kW as it is described by the electric company). Although I'm a programmer by trade I have a background in electrics so I wired it and built a panel myself. I have each 3 phase machine on own circuit breakers. Every 3 phase wire being 4sq mm or 11awg wire so no longer I have to deal with a voltage drop that would switch off a plasma cutter when cutting half inch plate (this its max).
I have put in pipes for water, sewage and cooling water loop from my rainwater tank, but I had no time to hook them up yet.
If people are interested in how I have it set up I'll post more photos.
It is cool to be able to see other people's construction and compare.