Just curious but I'm going to be working on a conversion of Deathwatch to Only War rule-set and just wanted some extra eyes on the conversion to make sure I'm tagging everything I can think of. Any suggestions for what I should watch for to make sure nothing falls between the cracks?

Big one to watch is the change in Unnatural Characteristics.

Combat actions also changed. Your "to hit" is now worse the more you swing/shoot in a single round so it pays to aim rather than spray and pray. Plus psychic powers became threshold based.

Good things to keep in mind.

You may want to rule that every 10 toughness gets you an extra unnatural toughness. The xp cost for toughness is through the roof to get only 1 bonus rather than 2.