The Center for Space and Innovative Technology continues to cooperate with the Adriatic Aerospace Association (A3) on the launch of the first Croatian satellite – Perun I. As part of this cooperation, a platform for testing the engineering model of the cubesat satellite (flatsat) was designed and built. The test platform is adapted to connect cubesat satellite modules that follow the PC/104 PCB format. The main function of this platform is the horizontal connection of several cubesat modules (as opposed to the vertical connection of cubesat modules during the final assembly of cubesat satellites in the chassis). Additional functions of the platform are power source management (external or EPS module), CAN and I2C communication interfaces, and management of EPS module and Killswitch of the cubesat satellite. The testdock was designed and built by Jurica Kundrata, PhD.