Hi guys,
I can't comment on the status of the OPs project, but if you're interested...I have aftermarket magazines available in 5 shot and magazine style single shot adapters. I have aftermarket 10 rounders available but they are not currently in stock.
I'm not sure of the rules here so I won't post a direct link. PM me for a link to the website if you're interested.
Mine are not metal, they are made from laser sintered Nylon 2201.
Thanks! Happy shooting!
Jim