Question regarding the new custom chapter rules
You have three options for a battle-forged army.
Firstly, you can have a Space Wolves successor chapter that is painted green and fiery. You can take datasheets that have the SPACE WOLVES keyword (such as thunderwolf cavalry and fenrisian wolves), and pick two successor chapter tactics (or Inheritors of the Primarch for Hunters Unleashed). You could use Space Wolves stratagems, your Warlord could take a Space Wolves warlord trait, and/or take Relics of the Fang. Your &quot;super doctrine&quot; would be Savage Fury.
Secondly, you can have a Salamanders successor. You can't take thunderwolf cavalry and fenrisian wolves, but you can take a pair of successor chapter tactics (or Forged in Battle). Then you can use Salamanders stratagems, warlord trait and relics. Your &quot;super doctrine&quot; would be Promethean Cult.
Thirdly, you take the SPACE WOLVES (successor) units that you want in one detachment, and SALAMANDERS (successor) units in another detachment. Each detachment gets it's own chapter tactic. You don't get either Savage Fury nor Promethean Cult, as those require your whole army be SPACE WOLVES or SALAMANDERS respectively.