The biggest hurdle (besides knowledge) in an endeavor like this is cost. Those sponsors aren't providing technical expertise. The main 'competitive advantage' USC RPL has developed that enabled this space shot is their in house filament wound carbon fibre cased ammonium perchlorate motors. By swapping comparatively heavy/over engineered aluminum motor casings that are reusable they make single use cf cased motors. I'm pretty sure Boeing and SpaceX aren't the places you go for solid motors.