Knoppix comes with LTSP as part of the CD and that should do the trick. You'll find it under the KNOPPPIX->Services menu structure as "Start KNOPPIX Terminal Server".

if you don't want a GUI on your workstations then when it prompts for parameters to boot, remove the default "wheelmouse" setting and add "2". That'll boot the workstations to runlevel 2 so you'll get networking but now GUI's. If you want to customize the system, then you'll need to mess with NFS exporting a partition from the server to your workstations and seeing if you can get them to run somekind of startup scripts like knoppix.sh and add "myconfig=scan" to the startup option.

Hopefully this is helpful.