The broader/commercial impact of this Small Business Innovation Research (SBIR) Phase II project is enabling a new avenue to high-fidelity and long-duration satellite testing at the edge-of-Space, and with it, rapid and reliable satellite missions to Low-Earth-Orbit and beyond. More than 35% of satellites fail at the component, or system level, after their deployment into orbit. Available testing platforms do not meet the industry's needs for rapid and low-cost technology risk reduction, therefore slowing the progress of the race to space. Satellite testing at mesospheric altitudes will increase the reliability of satellite launches, bring down the cost of those satellites, and open a new chapter in the growth of the space industry. This capability is critical for increasing the success rate of space missions. Enabling access to previously unreachable mesospheric regions will unlock new opportunities unknowable today and whose boundaries are yet to be defined. Providing near-space testing services to Space and aviation industries, military divisions, and the telecom industry will save hundreds of millions of dollars lost to deployment failures. This Small Business Innovation Research (SBIR) Phase II project aims to complete engineering and validation activities for a novel mesospheric ballooning platform to enable faster, less expensive, and long-duration (>hour) access to the mesosphere for providing near-space sub-orbital testing services for satellites and space paylo