How to: Fill that alcove with shelves

I’ve recently moved back in with my mum to save some cash for whatever comes next (mortgage, travelling, van .. who knows?) and have an increased need for maximising space. After fannying around playing bedroom Tetris on sketch up, I finally ended up with my desk in the alcove.

Fitting your furniture in is trickier than you'd think!
Fitting your furniture in is trickier than you’d think!

Tools:
Jigsaw
Plumb-line
Pencil