Single frame structural support

Weight 156 Kg. I conceived this structure as monolithic because I thought that to the effects of mounting under the train carriage there are no differences compared to fixing the single bars on the loading boxes and then hanging them on the carriage. I have kept the two end bars unaltered with respect to initial design because they are very sturdy and the orientation of the UPN profile is set according to the greater moment of inertia is then ideal to withstand the longitudinal stresses of 3g with respect the X axis. Moreover, the two longitudinal beams assemble all the other points of constraint with a very short overhang. Thus the ten fastening points thus made absorb most of the longitudinal load, justifying the resulting very low deformation. So I thought that the appreciable weight loss associated with the high rigidity is a good compromise.