Hi Troy,
I think one of the problems is the lack of detail and it would be great if the renderings were a little more refined. The renderings show glossy, but to my knowledge all roto molded furniture is matte because of the texture of the material. I know it is possible to roto mold polycarbonate, but I am assuming this is polypropylene. There is also a lack of clarity on what exactly is going on with the upholstery. A few renderings of this chair in environments would greatly help tell the story of the furniture. Side note, I would worry that because the sides are higher than the person it would get quite hot if you were sitting outside in the heat with not much airflow. If I were to invest in the chair I would want to have full confidence all details and manufacturing issues are resolved and with the few renderings you provided it is hard to open the wallet. You might have all of these issues worked out, but I think you could do a better job communicating the design.
Other than that it is great to see you going for it! Best of luck!