Agreed. Yet I'd like to leave a question: what makes a loyal chapter a renegate chapter? as a open one .

Agreed. Yet I'd like to leave a question: what makes a loyal chapter a renegate chapter? as a open one .

Simple - the High Lords of Terra and the Inquisition as they are the ones who can sign off on the paperwork to make it thus. Otherwise Chapters are either Codex or not. The fact that 9 times out of 10 the ones that fall to chaos are the less than 100% Codex chapters might be a reason the Ultramarines and their successors get so anal about following the codex!

The galaxy is very large. Possibilities abound. I know I wouldn't want to run this game or play in it. Sounds like a good solo adventure, though. I'm not sure what the problem is with a stereotypical game. If I could play enough of those to get tired of them I'd have no end of great ideas for further games.

This actually sounds more like a game-in-parallel opportunity. A Rogue Trader "Master of the Fleet" is an NPC issuing instructions to an otherwise standard RT group. At the same time, the Deathwatch rules (sans the Deathwatch tree) are used to run a veteran squad.

The Not-Actually-Deathwatch game governs the pace of military action, while the RT game focuses on supporting the Chapter economically and logistically. Goals are assigned such as "get us 200 frag grenades, we're low," or "the Forge World we have a treaty with is blockaded by a Chaos warfleet/Tyranid swarm/Tau invasion force, and we need land-raiders. Run the blockade."

Edit: I wouldn't expect the RT to be able to field Astartes at all, because they're all to busy being Space Marines to worry about economic matters, so it would mostly be background stuff.