I came to know about HPSDR project through the Flex Radio SDR-1000 discussion group. Please check the HPSDR web site for details.
Completed building Atlas backplane. Here is the picture:
Completed assembling components required for testing Mercury. The lower trace on the screen in the picture below shows the whole spectrum from 0 to 55MHz at the antenna input - something which a conventional recever will be unable to do !