I needed some fire extinguishers for my loco shed and I tried to make something up using wire etc and nothing looked acceptable so I started searching the web... I found some made by Tomar Industries at http://www.tomarindustries.com/
I was not sure what they were made of so I emailed them for more information. "White metal" was the prompt reply so I ordered their 10 pack on Friday and they were in my mailbox on Monday!
Some needed removal of small bits of extraneous material...
and of course they need some paint..
I am very pleased with the end result and I rate the product 5 stars !