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I stumbled on a placement of 1 herschel + 2 blocks that created a spaceship (maybe and LWSS) quickly, without any other remaining junk (except for a few still lifes), but I forgot to save it. (Boo hoo!) can anyone help me out? Additionally, what's the best program/script for automatically hunting for such things? Thanks, Alan

Did the initial blocks survive after the reaction was complete? If this is the type of output you want, then Paul Callahan's ptbsearch is probably the best program to use. The source for ptbsearch can be found here. For an overview of Life search programs, see here and here.