Hi,
local locksmith are an option but mostly they can/will only produce raw chassis at reasonable costs and you need to punch/drill the holes by your own.
You could also try companies that laser cut and bend chassis. This is usually quite expensive for prototypes, but as soon as you order a series it may get much cheaper per unit. The problem is to deliver the necessary 3-D dataset (CAD) that they can use for their processing (compatible to their software) otherwise these are probably additional costs. I once asked one of these laser companies and they gave me a quote of more than 200€, far to much for a single chassis for my hobby, but may be ok for (semi-) professionals when they order series of chassis on a reduced fee.
Good luck. I think there are many people here that appreciate your feedback for their own projects.
Cheers
Gerhard