Oh, and BTW, i found a full warhammer fantasy roleplay conversion for 40k. I can email the PDF file to anyone who is interested. It is pretty comprehensive, with new skills and careers and everything. All i really want to do now is think up some stuff to fill in the gaps. Gaps like:
->Are there female Tau?
->How do Tau reproduce?
->How, precisely, do bonesingers produce wraithbone?
->What other alien races might be encountered?
->Are there any Chaos worshippers who are not human, or is humanity the only race that follows Chaos to a large extent? There was chaos race mentioned in the Eisenhorn trilogy, but what about Orks, Tau and other races that presumably must exist yet do not have an army?
->What does the imperium do if a planet experiences a revolt that changes government but remains loyal to Terra? Say, a monarchy is overthrown and modern democracy is instituted which is fully loyal to the Emperor and his followers - what does the Inquisition do?
->The Emperors Tarot - is it a form of psychic power, or does it genuinely draw power from the Emperor?
->Does the Imperium ever terraform planets to make them more inhabitable, or has that technology been lost? It exists in the modern day, so why is mars not a green planet?
->The Eldar - how does their society actually function? We know about military organistation, but what about peace time - do the Farseers control every aspect of the craftworld? How do they carry out maintenance of the craftworld?
->Just how big is a craftworld - small moon, large space station or what?
->What percentage of every race is a psycher?
Stuff like that. I have ideas for a lot of it, and i think it would be needed for a RPGs GM to know this stuff.