I recently purchased the Deathwatch RPG and am getting ready to get a campaign going, but I have a few people interested in playing that want to play Sisters of Battle. I'm not totally convinced that I want to buy, "The Inquisitor's Handbook" just for the small section that details the Sisters of Battle, so I was wondering if anyone had some ideas to help convert the Space Marine stats into Sisters of Battle ones. To be completely honest, I'm only moderately familiar with the 40k universe after being exposed to the, "Dawn of War" series and a few of the novels. But I'm not quite sure what the major differences are between the SoB and a SM. The SoB wear power armor like SM, but aren't genetically engineered to be quite on the same level as SM's, as I understand it, so could I get away with taking away some of the extra abilities the SM get via organs and instead give the SoB characters a few extra experience points to allocate into skills, making them more versatile and knowledgeable, versus out-right powerful? I already told the people interested in playing SoB that they might be a little underpowered when compared to their SM counterparts, and they are perfectly fine with that, as long as it isn't overwhelmingly underpowered. We're interested in making them "feel" different and set apart from their normal, SM counterparts and they want to play the SoB mostly for the RP flavor that it could add to the group. Can I do this without the fluff from Dark Heresy? (Not having information on Faith powers, etc., from said supplement? I'm not really interested in having my SoB players make Rank 13+ Ascension DH characters and have them grouped with Rank 1 DW SM's, so I'm looking for an alternative solution). Maybe I can throw in default specialization with Flamer weapons, etc?
I'm also not really interested in the Rogue Trader or Dark Heresy universe, as my group is flat-out big into the Space Marines and none of the other fluff (they being 40k: TT gamers), so that is another reason I'm not interested in dropping the $ for the Dark Heresy supplement.
Also, I'm looking for a good scenario to run and I'm not unaccustomed to moderately or heavily modifying campaigns. That being said, what would be a good first campaign to run?
Thanks for the input!