How much do we know about "Older" ASW games?

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Titles like Prismaticallization (Dreamcast) or Exector (Playstation One) or other stuff that is ARC System Works exclusive (in-house).

 

I ask about Exector in particular since it was something that supposedly Daisuke Ishiwatari was involved with.

 

I am more or less looking for early designs and content and concepts that show off their history as a company a little more.

 

Their 20th Anniversary book covered a few things but, it doesn't exactly go in to detail about everything, so I wanted to know if we could find anything.