I found the writing style a little bit clumsy, and the wrap-up a bit hasty, but a generally enjoyable story otherwise.
As a fan of "vintage computing", this is superb. As best as I can determine, the PDP-3 was never an actual product. A single one was built, and not by DEC. I wonder how this document fits into the history of PDP computers? This appears to be a genuine document, but I'm not any sort of exert to ascertain that. A good time-line of PDP's is at:
http://www.faqs.org/faqs/dec-faq/pdp8/