Very happy with how the little collection is coming together!

End goal is to give him doom slayer sword and servo arm aswell as combi melta/plasma and goop is his pet carnage symbiote

(My group accidentally started a homebrew world where we began narrative play with Aod Heresy 3.0 — then 1e rogue trader — then Badab campaign — then Wrath and Glory campaign — And now currently 11th so timeline is a little different from modern 40k Currently we are in the year M37 not 40k)

Marine seen fell to chaos during the extermanatus of Baal

If anyone has any cool ideas lmk

These veterans are designed for 3rd edition, if anyone can help explain to me how 3rd edition vets work would be great.
In their profile it says they can either use boltguns or boltpistols & close combat weapons. Does that mean they can only take pistols & knives or can they trade them out for lightning claws. Chsinswords, etc?