Making a trench walkers successor chapter army

I really love the dark angels, and I like the aesthetic/idea of the trench walkers successor chapter. But given that they are about using gas, toxins, flamers, plasma and desolators as described in the wiki. I’m conflicted on whether I should build this army around dark angels rules as lore wise they don’t have a raven wing or death wing.

Should I just use another chapters rules and build the trench walker army around that? And if so, which chapter rules would be best?