MrMoustaffa wrote:
Unfortunately, codexes are pretty much limited to one faction or race by their very design.

For example, tau won't have orks rules in it, space marines won't have rules for space wolves in it, etc.

List building programs like Battlescribe *usually* have all the rules needes to play each unit in them, but don't count on it

 Captain Joystick wrote:
Killteams is a very small scale game, relative to 40k. Deathwatch are a low-model, high-points army, and the two meet at a point where you can expect to field as little as five models at 200 points. That'll be a small army with potential to deal with most threats they'll encounter individually, but probably not enough by way of defensive saves to weather a comparable force.

The killteam packages they have on their site include all the rules for those pieces, everything you should need to field them as described. Slight problem: some of them are actually invalid teams according to the actual killteam rules.

Battlescribe should be sufficient to get by and at least decide where you want to go with it, I won't tell you how to find the additional army-specific rules but they are available if they aren't present in the 40k datafiles (some creators on that project only provide the names of rules)

You can make multiple different killteams from one specific faction if you want, and especially if you're playing with other people I wouldn't recommend buying pieces of multiple different armies in order to do it.