Project Nemesis is a fan driven website for games that use the One-Roll Engine (like Nemesis, Wild Talents, Reign and Monsters) or Chaosium's Basic Roleplay System (BRP) (like Call of Cthulhu) and the Delta Green setting.
I have run a trial game pitting Space Marines against Orks. For the Orks I used the rules found on this site. I came up with the following stats for Space Marines using the REIGN system.
In the coming decades, technologies like genetic engineering,
artificial intelligence, and nanotechnology will transform humanity. A
strange new world is unfolding – nightmarish to some, utopian to
others. Soon we'll have the power to reshape our children's genes,
build machines that think, and upload our minds into computers.
Why have lists of weapons with each having its separate rules and cost, when you can also have a "weapon menu" and what your order determines the cost? Sounds too good to be true? Well, let's try it out.
As both systems - Dark Heresy and ORE (one roll engine) - are percentile based the conversion is quite easy. Below or my rules for character generation:
All Stats start at 2d. (Cost 24d)
For most PC's roll 12d. Then discard any 2d. (Cost 30d)
Pick upper or lower path for all sets.
Pick which table for each single die.
Then each player gets up to 6d of skills or stats to assign. (Total cost 60d)
ORE Science-Fiction 
