o = 0.25; (* overhang *) d = 0.1; (* thickness of stand *) h1 = 3; (* height of stand *) stand = Graphics3D[ {Cuboid[{-o,-o,-d},{w+o,l+o,0}], Cuboid[{0, 0, -h1},{d,d,-d}], Cuboid[{0, l-d,-h1},{d,l,-d}], Cuboid[{w-d,0, -h1},{w,d,-d}], Cuboid[{w-d,l-d,-h1},{w,l,-d}]} ];
In[8]:=
Show[stand,aquarium];
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