All roughly codex-compliant marine factions should have 1 book with a handful of special characters and a unique unit or two, and have a supplement for each gene-line ala angels of death for more flavor.
So your outliers should be Wolves and Grey Knights, as they basically share vehicles and nothing else.
All the other first founding along with Deathwatch can be fairly easily be done similarly to the 30k legion list, with a couple of unique things for each first founding+successors, along with a tactic, 3 relics, and warlord trait, in 1 big book.
Assuming of course GW
gets off their ass and actually makes some chapter specific units for people other than the ultras, ba, or da.
And then you can flesh out specific chapters more with their own smaller book, and so marine factions get to be fleshed out, without making the main marine dex even more bloated, but people who want to play an unknown founding and mix up what tactic they use sometimes can just have 1 main book.
"The Last Wall" for the sons of Dorn, (Imperial, Crimson, and Templar) "Angels of Death" for DA and BA, "Forgemasters" for Iron Hands and Salamanders, "Unseen Blades" for Deathwatch and Ravenguard, and maybe "Outriders" for White Scars and some unknown founders.
But that's just me.