Thanks for the reply and I hear you, but I am not trying to make a commercial product, just something for my own use. It'd be also fairly hard to understand what the thing is for without the context, so I am not worried about it being cloned or the idea stolen. I do care about prototyping it as cheaply as possible. I can also wait.

The cost angle rules out local machine shops as they are (really) expensive. Hence the quest for the online services.