HI. FIRST TIME ON AND I WONDER IF ANYONE CAN HELP. RENDERING DIFFERENT TYPES OF BLOCK IN THE SAME WALL. I'M THINKING OF BUILDING SOME OF THE OUTSIDE CAVITY WALL WITH DIFFERENT BLOCKS..ie HIGH DENSITY, MEDIUM AND EVEN THOSE LIGHTWEIGHT ONES AS I HAVE THEM BUT NOT ENOUGH OF ONE TYPE TO DO THE WHOLE WALL. IS THERE A PROBLEM WHEN IT COMES TO THE RENDERING? THANKS. REGARDS, JOHN