Open Subdive was used for smoothing, and the number of iterations on some elements was reduced to two. If you need more smoothing, apply another Open Subdive from the modifier stack, the stiffeners are already configured
Version: 2016Units: MillimetersDimension: 1987.92 x 2916.07 x 1717.78Polys: 30 661Render: CoronaFormats: 3Ds Max 2016, OBJ, FBX