I plan on building my own shed soon
It will be 2x4 Timber (Probably ACQ Hardwood or untreated pine)
Plexiglass window, gravel , cement blocks and corrugated iron
and OSB
Might even do Sandbags for sound dampening and insulation
between the timber/OSB
Ill be making mine with
Rain Tank
12v DC wiring
Ethernet Ports
Tiny Rocket Stove
Skylight