Good questions!
There is said to be a "public" or "village" version and a "private" or "family" version of Ku Lo Pin Sun. The public version was a set of basics taught early on to villagers in need of a self-defense method but who weren't interested in going in-depth into a martial art. A more "fleshed out" version of this was also taught publically to "out-siders" when people from the lineage left the area. One example is said to be what Fung Sang taught in Hong Kong in the 70's. The KL 22 system and the "40 Point" system are also considered "public versions." These versions vary in content somewhat because the people teaching them didn't feel obligated to stick to the traditional curriculum and so changed things around as it pleased them. The "private" or "family" version is said to be the original that was reserved for people learning directly within the lineage in Ku Lo village. Henry Mui has lived in Boston since the 70's when he immigrated to the US and has taught both a "public" version early on and the more authentic "private" version later in his teaching career. The problem is different people will give you different opinions on what is "public" and what is "private" methods. It can get pretty confusing and somewhat frustrating.
A "point" or "San Sik" or what I just like to refer to as a "short set" is the basis of how the curriculum is organized. This is still Leung Jan lineage Wing Chun, just organized a bit differently than what you see in the Ip Man branch and others. Rather than the 3 longer forms of Siu Nim Tau, Chum Kiu, and Biu Gee along with a long dummy form....Ku Lo Pin Sun is organized into a series of short sets divided into 3 levels. Each short set is an independent "form" of at least 3 movements or techniques that can be repeated over and over as a drill. Each of these sets has a formal two-man drill that teaches the main application or concept in the set, a version of the set that is practiced on the dummy, and a way to do the set in a Chi Sau situation. The application or main concept from each set can also be worked on in a "San Sau" format. This is less defined and formalized and is essentially trying things out in a sparring-like situation. The short sets do indeed build upon each other. They can also be strung together and practiced back to back, in which case the end up looking much more like a "form" that people expect to see. If you take the typical Ip Man SNT form, then break out the "Pak - Tan - Palm strike" portion and practice it over and over alternating sides, what you have is actually one of the level 1 short sets from Ku Lo Pin Sun! We would then practice this same thing on the dummy. We have a two-man drill that puts it into action. You work the Pak-Tan motion into Chi Sau, etc.
The Knives are said to have been added to the system later on. Some branches have an actual "form" and some simply pick up the knives and perform an adaptation of each of the short sets with knives in hand. This is the way I do it and it works pretty well.
The pole is an actual form and is "3 1/2 point" rather than "6 1/2 point" and is very short, as you might expect. It also uses a short pole...around 5 ft in length rather than 8 ft.
The Chi Sau platform is more of a "coiling" action like a Huen Sau rather than the up and down action from Bong -Tan as in Ip Man Wing Chun.
Pivot point is at K1, not the heels. Weight distro is 50/50. That's the essential run down of the system.