To my understanding, Kan Dak Hoi's Monkey Boxing is
Dei Tong Moon/ Earth Court System in "Monkey format", meaning that the system explores the implimentation of combat floorfighting from a variety of situations, comprised within the five
Tai Sing Mun/ "Great Sage System" forms...
Just rolling around on the floor is not so practical, as it is predictable, in that its range, while unique, is limited. The other fighter can quickly come up with a set of tactics against it ("all lower gates", eg)...
Therefore, the Monkey strategy is up, then down, then up, then...
Something "unorthodox", ok, like every weird rolling attack, cartwheel kick, scissor drop, sacrifice throw that you never expected. Also, that "Monkey Climbs to Treetop" move, running up the guy's leg, then knee him in the jaw!
Monkey System hand technique, aside from floorfighting, GM Chan Sau Chung shows a good bit of longhands and joint locking when he demonstrates his Monkey Applications, demonstrating the Monkey system's further integration with the
Pek Gwa Mun/ "Axe Hand System" as currently established in modern times:
http://www.youtube.com/watch?v=xJlBelMGaYs
Lau Ga Leung apparently spent a good amount of time around that particular school, as he used Chan Sau Chung's students in a number of his movies. Therefore, beyond a form or two, or a couple of "applications", when it comes to actual system representation, for a mental picture of representative practical training, I'd say that between those two schools is probably close...
Best,
Michael