Sheppz garden / shed

It's a perfect storm for project/scope drift/creep and shows how people end up with 20k cabins.

My 2p based on your post is:

• think of it as storage + a 2-3 season work space
  
• buy a used shed (right depth, possibly longer so you can canabalise parts
  
• modify for big window
  
• cheap foil bubblewrap insulation + ply for walls, maybe splash out on foam for the roof, use thin painted hardboard for ceiling
  
• thin insulation + hardboard floor + vinyl
  
• twin rack shelving on the back wall
  
  
  

This basically my long term plan, with a wooden doubl~ glaze instead of big window