The linking page says:
pre-compiled bundles that are still intended to be dropped into a repo and vendored like script modules, but the bundle will be an agglomeration of modules likely to be maintained independently of the project and upgraded all-at-once
As of this writing, the majority of the (small set) of triple scripts are using unmodified copies of trplkt as their Build.app.htm. This raises the possibility of more custom build scripts—e.g. ones that consist only of a custom shunting block that links against a trplkt-derived libpack and a project-specific build coordination module. XXX A convention to consider:
meta/builder/ as the appropriate place in the source tree.