Peter Bederka
Viac nápadov od Peter
Staircase Calculator- this website has calculators for all kinds of staircases including double helix spiral! Also has TONS of other conctruction calculators, basically the holy grail website for help with designing building plans!

Staircase Calculator- this website has calculators for all kinds of staircases including double helix spiral! Also has TONS of other conctruction calculators, basically the holy grail website for help with designing building plans!