Hi from newbie on forum

I am not newbie with composites though, but still could use some help. I designed a sports car with exo skeleton support chassis which I intend to do with carbon fiber (resin infusion). I'd like to make it as one piece (pic 1 left) but I am not sure if it is possible. I hope you could help me to figure it out, if not what would be the best way to glue two pieces together (pics 2 right, 2 left) so they act as one. Attached photo show desired result


Thanks
Sylvester