Wow! The next time the guitar players start talking about the the length of the tenons in their Les Pauls....I am just gonna send them this.
As to the tuners, it's more traditional to use non-extender keys.
If you're new to building instruments, Stewart MacDonald is a decent one stop shop for tools and parts. You can often find better prices elsewhere, but they have a very easy to use site:
http://www.stewmac.com/
Allparts has a nice selection of bass tuners, though you have to be pretty careful about checking the tech specs before ordering because the descriptions aren't great.
www.allparts.com
Lastly, there are a few specialty shops that carry hardware. Like this one:
www.bestbassgear.com
As you are probably going to find out, it is pretty hard to get everything you need from one single source.
As to the tuners, it's more traditional to use non-extender keys.
If you're new to building instruments, Stewart MacDonald is a decent one stop shop for tools and parts. You can often find better prices elsewhere, but they have a very easy to use site:
http://www.stewmac.com/
Allparts has a nice selection of bass tuners, though you have to be pretty careful about checking the tech specs before ordering because the descriptions aren't great.
www.allparts.com
Lastly, there are a few specialty shops that carry hardware. Like this one:
www.bestbassgear.com
As you are probably going to find out, it is pretty hard to get everything you need from one single source.