Are there plans for enclosures written anywhere?

Is the two tower base reflex or acoustic suspension? If BR, do you need to by a port tube separately or is it included in kit or not needed?

All models of π speakers are either bass-reflex or horn, or a combination of the two.

If a ducted vent is used, then port material is included. For example, the two π kit uses a 2" duct so a tube is included. The two π tower does not use a duct, rather, the port is just a hole cut in the rear panel. The four π speaker uses a rectangular port made from wood.

Kits include the speaker drivers, the connector panel, hook up wires, "π" logo decal and a printed copy of the plans. For larger speakers that incorporate a compression tweeter and crossover network, kits also include the crossover, tweeter compensation cable assembly, Zobel woofer damper, and all cable assemblies are completed and ready to install. Every kit containing a compression driver also includes the horn flare and the bolts to mount the driver to the horn.