I like the idea of what you want to do, but I think you've got a steep learning curve ahead of you.
And I get the feeling your design team is obsessed with hexagonal shapes.
You might consider going past that into first doing what's structurally required, and then perhaps add surface etching or embossing or similar (or just decals/paint) to give the appearance of hexagonal structure.
Hexagons are an efficient shape for storage (like honeycombs used by bees), but they are not structurally rigid by themselves.
You should look up some things like Truss and Trestle bridges, or almost any triangulated structure, to see what makes thing structurally strong.
There are also different parts of the frame that do different things. Typically, stuff along the top of the main frame is in compression, while stuff along the bottom is under tension, though that doesn't cover the torsional / twisting forces from front to back that occur while riding.
Similarly, the rear swingarm will have these forces on it. Additionally, I don't see anything to prevent torsion from twisting the swingarm out of shape, allowing hte rear wheel to twist sideways (for instance, top to the left and bottom to the right) vs the frame itself. It would be like riding a rubber bike, especially since there's nothing connecting the two arms together, so they would be able to pivot separately during this torsional movement and it would make the twisting worse.
You can make a swingarm that is still "open" for belt installation by having it bolt together as a modified "H" like many swingarms are (in top view), without it being completely open as separate arms like the only drawing uploaded so far shows. Then the arms can't move independently, and the entire assembly will be stiffer and less prone to twisting.
Made from extremely stiff and strong materials, the frame might work as-is, but I'm not sure what those materials would be.
(note that I'm not an engineer, but I have a fair bit of practical experience in building things that don't work as intended, and having to modify them until they do.