Hello.
This set of conversion notes is different from Plushy's; the emphasis of his laudable efforts is on importing DH characters into Only War. The purpose of this adaptation is to import the character advancement mechanics from Only War into Dark Heresy (eliminating 50 pages of class advancement tables), and also to achieve a rough equivalency between the classes of Only War that show major disparities in comparison to each other.
The notes can be found here:
http://www.scribd.com/doc/123289891/Import-Only-War-mechanics-to-Dark-Heresy
If that doesn't work for some reason, you can email me on yahoo, user ID seraphic8x.
This set of Conversion notes is premised upon two positions: First, that there is major disparity between the costs of advancement for different classes within Only War, and Second, between the same classes in Only War and in Dark Heresy. Obviously, if you disagree with these positions, the utility of these notes is diminished. As always, criticism improves a work, so it is always welcome.
Arguments follow…
Only War: Class versus Class Relative Comparison
An example of this is the grotesquely unfair disparity between the Operator and the Stormtrooper:
OPERATOR
Simple Intermediate Trained Expert
Weapon Skill 500 750 1000 2500
Ballistic Skill 250 500 750 1000
Strength 500 750 1000 2500
Toughness 500 750 1000 2500
Agility 250 500 750 1000
Intelligence 250 500 750 1000
Perception 250 500 750 1000
Willpower 500 750 1000 2500
Fellowship 250 500 750 1000
STORMTROOPER
Simple Intermediate Trained Expert
Weapon Skill 250 500 750 1000
Ballistic Skill 100 250 500 750
Strength 250 500 750 1000
Toughness 250 500 750 1000
Agility 100 250 500 750
Intelligence 500 750 1000 2500
Perception 250 500 750 1000
Willpower 500 750 1000 2500
Fellowship 500 750 1000 2500
The formatting didn't really carry over; hopefully it is clear enough.
Here we see the Stormtrooper has 2 simple characteristic advances costing 100, while the Operator has 0. Furthermore, wise choice of redundant Characteristic Aptitudes during character creation enables the Stormtrooper to acquire 4 different Simple characteristic advances for 100 XP, while, even with intelligent choices, the Operator will have only 1 Characteristic Simple Advance at 100 XP (Perception), at best.
Furthermore, by choosing Intelligence as one of his extra Aptitudes, the Stormtrooper will be able to Operate and Navigate any vehicle as well as an Operator. At this point, Tech and a 300 starting XP difference is intended to serve as inducement to select the Operator class. The problem with this reasoning is that the Tech Aptitude applies to only 2 skills and 11 talents (and 0 Characteristics). Even then, 7 of those 11 talents are useless without Mechanicus Implants, meaning: it’s really 4 talents and 2 skills. So our Stormtrooper starts out with Tech-Use from Siege Infantry, and now has one matching Aptitude for all Tech based talents and skills except Orthoproxy. The result is a character that pays slightly more for a few Tech talents and skills, and is superior to the Operator in every other way, from starting equipment and Wounds to Characteristic increase costs.
Adding insult to injury, the Stormtrooper has lower XP costs for raising the primary Characteristic for Operators (Agility), than an Operator does. The upshot: the Stormtrooper is a better Operator than the Operator is. And the same is true of the Medic; just substitute Knowledge for Tech (though the array of possible Forbidden and Scholastic Lores is greater than Tech skills). Aside from the Lores, the best argument in favor of the medic is probably the Mastery talent, but even that is just 200 XP per instance more than the Medic's cost for our Intelligent Stormtrooper.
If the Stormtrooper spends his starting 300 XP on: Medicae, Navigate (Surface), Operate (Surface) and starts with Tech-Use as described above, the result is a Stormtrooper who is simultaneously a decent field medic, and pilots as well as an Operator, while possessing a formidable offense neither of the other two classes can even hope to challenge. The next 400 XP earned will be spent on Trade (Chymistry), C.L. (Tech), and S.L. (Chymistry), which will complete the starting packages for the Medic and Operator. Meanwhile, the armor, Wounds, weapons and offensive abilities of the Stormtrooper assure that the character will live long enough to learn them.
This massive imbalance is no doubt a large part of the reason there is a massive preference in the community for the Stormtrooper class: its just plain better.
So this clearly demonstrates the disparity between some different core classes in Only War.
Next, Dark Heresy classes versus Only War classes…