With respect to crater and rille formation, I accept that firing rocks at a composite lunar surface can and will produce craters of varying shapes and sizes, revealing no doubt many similar features to those craters found on the Moon and other cratered bodies (I too performed this experiment years ago).

B.A. - I do not wish to task you, but I have checked out Dan Durna's website and could not find a direct reference as to the results of the experiments you mentioned.

Do these experiments performed by Dan Durna also reveal various aspects of typical crater morphology such as circularity, central peaks, terraced walls, flat floors and other complex features?