The ATLAS Experiment will upgrade its inner tracking system for the High-Luminosity-LHC
with an all-silicon system. The strip part will be based on individual modules, constructed by
gluing the front-end hybrids directly onto the strip side of the sensors. These modules will then
be glued onto a low-mass carbon-fibre based local support structure with integrated services.
This paper presents the first double-sided module made from full-size end-cap sensors by gluing modules onto a reduced-size core. A summary on the experience gained in the prototyping process and results obtained from running this module, with emphasis on signal integrity and noise performance will be given.