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I know this sounds pointless, but it states "If a detachment is from a successor Chapter, you must adopt the Chapter Tactics of the First Founding Chapter from which that successor Chapter descends. For example, a detachment of the Storm Lords uses the Chapter Tactics of the White Scars , and a detachment of Crimson Fists use the Chapter Tactics of the Imperial Fists" (Space Marine Codex pg. 77). Does this mean that if I paint my marines as Hawk Lords that I have to play them as Ultramarines? I know that some people will say "Oh, you shouldn't care about what the book says, you should play with people who won't care". Please refrain from saying that. Stay Classy -Feasible

That's what the rule says. If you don't wanna hear that if it's made clear an opponent most probably would be fine I'm afraid we can't help much.

It's like asking if you can use a Space Wolf army using the Dark Angel codex.
If all the models are WYSIWYG and you make it all clear to your opponent, then most people won't mind.
I personaaly wouldn't mind (but my inner fluff-monkey would die of sadness a little).

Paint them as normal, say they're a detachment of the Hawk Lords (note the extra space between the two words) which just coincidentally happen to be painted kind of like the Hawk Lords (the Ultramarines successors) chapter and give them whatever rules you want.

You don't even need the extra space. Nothing prevents you from playing a successor chapter with the exact same name, iconography, and paint scheme as a pre-existing chapter. You can even play an army you call "Dark Angels" out of the Space Wolf codex. WSYSWIG only extends to war gear. The only catch is you don't get to ambush your opponent . Make sure they know what codex/rules you are playing before the game starts. When you decided to play more then one chapter/codex using the allied detachment rules you should also try and keep your two detachments visually destructive (different paint or iconography) to avoid confusion. Even this is not required as long as you make it clear what units are in what detachment.

Also, don't be surprised if people don't want to play with you if you have a confusing army. The more you break away from what they expect you are playing at 1st glance the more likely they are to be confused by your list and just avoid you. TO should also make it clear what is and is not allowed in the tournament before you sign up. If its not made clear explain what you want and get an 'OK' before you join the tournament.

The good news is people are not likely to know the founding of many official successor chapters. If you tell people you are playing a Hawk Lords list using the Iron Hands tactics they might not even know that is a mismatch. I personally play dark angels. Some times I play them as codex space marines white scars, some times I mix the two. When I do its clear my raven wing models are one codex and my deathwing models are another. The models are black and bone white so telling them apart is not hard at all, but I've still had more then one opponant who thought my white scars (ravenwing) had dark angel rules because they are more families with the dark angels. Of corse making up your own chapter lets you pick a new founding every time you make a list bu that does not help people who have already painted their army.

Thanks to everybody who gave me a response, it helped a lot.

 grendel083 wrote:
It's like asking if you can use a Space Wolf army using the Dark Angel codex.
If all the models are WYSIWYG and you make it all clear to your opponent, then most people won't mind.
I personaaly wouldn't mind (but my inner fluff-monkey would die of sadness a little).

I'd be curious as to what your inner fluff-monkey would say to what I'm doing. I like the Exorcists, who (it's suspected) are a GK successor chapter. There are no Chapter Tactics for Grey Knights (since they have their own book), so I chose a CT that I like and went with it. My models are converted in a nice, fluffy way, and the paint scheme matches the Exorcists; I'm just using Fist Tactics.

Also, what CT would Angry Marines use? I'm going with, "They're so angry at the constraints, each unit picks whatever CT they want."

My Fluff-Monkey would be ok with that.
There's no Chapter Tacktics: Grey Knights after all, so picking a tactic that best reflects the chapter is the way forward.
This weekend I'll be playing against an Iron Warriors army using the Space Wolves codex. The monkey weeps....

Edit: Aren't Hawk Lords a Raven Guard successor chapter? Not Ultramarines?

 Elric Greywolf wrote:
Also, what CT would Angry Marines use? I'm going with, "They're so angry at the constraints, each unit picks whatever CT they want."

Naw, they use CT: Orks.

 grendel083 wrote:
Edit: Aren't Hawk Lords a Raven Guard successor chapter? Not Ultramarines?

No, contrary to popular belief, Hawk Lords are Ultramarine Successors. It shows it in the codex. (pgs 31-33)