Rick “Riku” Katsumata is a Japanese GBC builder living in Shizuoka. He loves to engineer and build GBC modules, but he is also an avid collector of vintage LEGO products. He likes the tenacity required to build modules and is most difficult challenge up-to-date has been the engineering of the Aphex Twin module, a massive pneumatic GBC module. His favorite home-made module is Square Motion Lift.