A place to discuss guns

All practical 9mm handgun designs are "parts kit" builds that rely on a conventionally manufactured (machined steel) slide and barrel. If you can't find links to those yourself, you shouldn't be building your own firearms.

For a fully DIY 9mm firearm, you're generally going to be limited to something along the lines of the FGC9. And even those need a steel barrel so if you can't buy one, you'll need to learn how to machine one (either conventionally, or with electrochemical processes).