For people interested in Hcam-B1- there is a new article here:http://www.bulbexposures.com/home/2011/10/13/out-there-with-the-hartblei-hcam-b1.html
I also use the P 45+ on my HCam-B1 (which I think is the perfect combination !) and we do now have a new Long time exposure radio remote Timer (100m range) with delays, series and exposures up to 9.99 Hours. Cost for that is 250,-€, can be used with any back and all existing HCam-B1 Bodies.
greetings from Munich