About this 3D model

This is my 4th multiwiicopter and the 2nd with this size All pictures will give you a better comprehension than a long speech I will add my perfect configuration of PID soon ! for the moment this is in testing with it I can fly in indoor / outdoor / looping the distance between each motors is 25cm the diagonal = ~35cm the arms are made with aluminium square tube 7.5mm x 7.5mm x 105mm - thickness of 1mm