At the end of my driveway I built a bike shed. Since there is no space to swing a big door open, I made it a rolling door. I bought the track and wheels online (link), and welded up the door at Make. The other welded parts are the U-channel at the top that guides the door, which is connected with two posts to plates that bolt into the concrete sill. The rest is 2x4s, siding and a corrugated metal roof. The white stuff behind the mesh is plasticore (Artisan has 4x8 sheets of this) The back of the shed is formed by the existing wall between our property and my neightbor's.
It holds our two bikes (could hold three), and once you have a shed, you can of course add shelves and stuff it full of other things.
The design was laid out in Fusion 360.
The lock (visible in the first picture) is a regular exterior door lock, so it needed a housing box, and the latch plate needed a housing too. These I cut on the plasma cutter out of sturdy sheet stock. In order to fold the boxes along the dotted lines, I made this jig:
I took an angle grinder, mounted a 1/8" cutoff blade and made a sled so that the blade protruded just a bit below the shoe of the sled. With some wood and clamps for a fence, I could grind about halfway through the sheet material, and fold it in exactly the right place, and without hammer marks.

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-rwxrwxrwx 1 spiffy spiffy 4003 Aug 20 17:12 latch_box.dxf
-rwxrwxrwx 1 spiffy spiffy 1933 Aug 20 17:12 latch_plate.dxf
-rwxrwxrwx 1 spiffy spiffy 2057 Aug 21 09:09 latch_plate2.dxf
-rwxrwxrwx 1 spiffy spiffy 2947 Aug 20 17:11 lock_bottom.dxf
-rwxrwxrwx 1 spiffy spiffy 3529 Aug 20 17:12 lock_plate.dxf
-rwxrwxrwx 1 spiffy spiffy 3954 Aug 20 17:11 lock_top.dxf
-rwxrwxrwx 1 spiffy spiffy 2495 Aug 20 17:18 top_plates.dxf