You can't mini a superbolt. They are already mini'd.
Good luck with it. I've worked on many different superbolts. At least half a dozen of them were my own personal guns. Here is my latest:



Here are the specs:
-midblocked
-midgitized
-custom titanium bolt pin
-the body was custom milled in addition to the midblocking
-the feedtube was chopped down as well as the feedneck which lowered the no-pro at least another half inch
-the frame was machined to reduce weight and match the ASA
-custom chocolate brown anno
-Un1tech kit annoed to match
-custom copper-cored stainless steel hammer
-sexy black macroline fittings
+more that I can't remember at the moment. I really liked that gun. As usual I ended up selling it and regretting it.