Do not try to extend the box part, rather extend the 1/4 cylinder, then!

sample:

 merge {
   box { 0, <1,-1,1> }
   intersection {
      cylinder { 0, <0,0,1>, 1 }
      box { <-1.1, -1.1, -0.1>,<0.1, 0, 1.1> } // instead of <0,0,1.1> 
      }
   }
     

-- 
Non Sine Numine
http://grimbert.cjb.net/

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