You would find the make_lv2_bundle.sh script in guitarix/src/LV2/
Usage is simple, just run
to create a LV2 bundle from a faust source file.
The bundle will appear in the guitarix/src/LV2 directory and comes with a included makefile to build the bundle independent, as well it include a wscript to include the bundle into the guitarix build environment.
To test your plug you could install it as user to (~/.lv2) (make install) remove it with make uninstall.
The LV2 plug wouldn't have a GUI, but it is prepared for the use within the MOD SDK to add a MOD UI.