Hi, I am very interested on what you are doing. Becaus I also plan to build my own frame, and I think that all the design of the craft might be re-engineered. A totaly different model without a center, seems chalenging. I think that it woukld be a good idea to build concentrating the weit near the motors to decrease vibration. Lipos could be placed to conter balance the camera. gps and antenas should go to a higher level, may be in separate receptacles. Arms don't have to be horizontal. Arms diameter should be variable, Section of the arms should have a vertical aerodinamic shape, like the shape of a water drop. Landing gear should be an independent structure, may be of plastic, pvc, something not rigid. The mais structure should be connected to the landing gear structure through elastic connections. Besides that, comes the search for the elegance of the model.
that's why I should lijke to know more about your thoughts on building an anusual frame.
C. Monteiro