Sorry to revive this old thread, but I can shed some light on the form origin.
Lian Bu Quan is from the WESTERN Dragon system, originally.
It is from Yunan province, rare to ever see their martial arts.
I have an old book from 1920s, called Orthodox Shaolin Lian Bu Quan.
In comparing how the form was done way back then to how Lian Bu is generally taught today, it is pretty much the same postures, nothing was lost.
The only difference is that the more newer way to do it that the two famous schools taught has different directions to do the sequences of postures.
They did improve it quite a bit, it was too linear and boring the old way.
You can see one version of the form in one of the Robert Smith books, he shows a step by step photo guide to the form.
Also, a GREAT version of the form is done by the Taoist martial arts schools.
It’s one of the better versions, you can buy the VCD of it here:
http://www.plumpub.com/sales/vcd4/coll_WDtaihe.htm
where it says:
VCD#1273 Dragon Boxing
About an hour, See Main VCD page for prices, CHINESE ONLY
Dragon Fist also known as “Continuous Stepping Fist”. It was created by grand master Liu Chong Jun, President of the Sichuan Martial Association, about 100 years ago. It was introduced in National Nanjing Wushu college & became a mandatory subject for wushu students. Fast movements are well-arranged & balanced. This is often known as Lien Bu and used as a “basic” set though, technically it does not serve that purpose all that well in that it has few truly basic movements. It is very common, the first form taught, for example in the Northern Shaolin system. This version, taught by the teacher with three helpers, bears little resemblance to the typical beginning level version - though it is definitely the same form. It is a fluid set with some complex hand actions.