Ah, ok! I thought you would make round stiles and then mill slots for the glass/acrylic into them.
Brass is expensive

. Strangely enough, there don't seem to be too many French suppliers on ebay, I usually got German, British or Chinese suppliers, when I did searches. The bizarre thing is that Chinese businesses and the postal system are so heavily subsidised, that it is often cheaper to order in China, than in your own country. I feel guilty towards our businesses, but it's money from my pocket ... Recently I wanted a thick 60 mm steel disc for a tool project, found something on ebay in Germany at something like 3 �, but then the shipping would have been close to 15 �, because they only wanted to ship insured. Got it from China within ten days for 4 � incl. shipping ...
Sometimes I go to Metaux Tartaix (
https://www.tartaix.com) in Paris and I think they also do mail order. However, the materials and the metro tickets are more expensive at the bottom line than an order from China. Plus the time spent crossing Paris and back on a working day.