Nice build. Next time you gusset a rear, try cutting a slot across the pumpkin instead of all that shaping and filling. Go down into the axle tubes just as deep as you need to, to bury the entire length of the gusset. An even greater time saver would be to press the finished part into some clay and fill the impression with epoxy for the next build. Don't forget to do both halves. You can actually include the torque ears on top or shape everything except the ears and leave grooves to glue any style ears you may come up with in future designs.