I'm looking for several submods

For the custom models I don’t know of any submod adding specifically that. I think More Bloodlines adds the Wall, but not the only thing it adds.

For the Red Wedding events, you have Sinstars’s Rainbow Weddings. Although it’s for hosting your own Red Wedding, not the canon event against Robb. Also, it’s pretty old, so it may not works correctly. If you want the canon Red Wedding consequences, your best guess is to start in a later bookmark, like A Feast for Crows.
The marriage event you mentioned is (I think, I’ve not played CK2 AGOT without submods since a long time) included in base mod, by starting in a Clash of Kings bookmark. More Bloodlines adds some events, like managing the Hornwood inheritance for Robb, but again, that’s not the only thing it adds.