Sounds great. There are a couple very interesting resources online for doing prototypes. Look at emachineshop.com
for example. There, you can do the 3D drawings and as long as you know what you want (e.g. tolerances and interference) you can send in the CAD and they can do the prototype for you in the material of your choice.
In the US, you can often find good prototyping at reasonable cost near the foundries. there's a large group of bronze foundries in Lewistown, PA. Because of that, there are also a large number of good patternworks shops there. Their pricing was/is better than most machine shops or pattern makers elsewhere. I'd used one there for a couple project in 2003/04 timeframe but for the life of me, can't recall the name.
Good luck with your project.