I had an internal on my 125 when it was started and took it off and did a external. I had 3 holes from the internal for 1 1/2" bulkheads, made a 3'x2"x6" internal weir box, made a 3'x6"x6" box for outside sucured with momentive rtv 108 silicone, driled bottom of outside box for 3 bulk heads used 1" this time. The plumbing is the same on either way you do it just requires a few different fittings. Mine could use some black acrylic inbetween the 2 boxs as the smoked glass from the internal isn't quite dark enough. Heres a couple pics.
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