  A scalable line of liquid argon TPC detectors is described, based on a three
dimensional cubic frame array immersed on a common liquid argon volume. The
paper describes general lines, main construction criteria, crucial points,
parameters and required preliminary R&D activities for the construction of
detectors with active mass ranging from 200 ton to 100 kTon. Such detectors
appear as unique for supernova detection, proton decay, LBL neutrino physics
and other astropaticle physics applications.
