Apart from some of the art work and bits of lore in a very broad sense, I remember next to nothing of rogue trader. I do remember you could have plasma and melta missiles and imperial guard dreadnought but as for who you mentioned, I wouldn't have a Scooby doo. However it was quite tongue in cheek, don't think the writers imagined how successful the thing would become
He is on page 144 in Rick Priestley's Warhammer 40,000: Rogue Trader
from 1987 for 1st Edition Rogue Trader. I linked the book to him.
1st Edition Rogue Trader was more of a parody than anything else.