Getting steel sections for Ronja

Czech Republic

Ferona Praha Holesovice, U Pergamenky 11, Praha 7. They also have a self-service with screws.
Kondor Praha . They have several departments around the whole country, they cut as you want. Just sometimes the cut costs more than the material.
Zamat Chrudim they have all sections necessary for Ronja, they cut as you need.

Dynamo Metallwerkstatt Zurich has very limited assortment of steel sections, however they have welding machines, plasma cutter, grinders and belt saw so that some things can be welded together or cut out.
Pestalozzi Dietikon, Zurich Dynamo says they take from them.