30k seems like the obvious choice, but can it represent his 6 Jugger champs?
If I were to run something like this army I'd use the chaos codex;
AOBF Terminator lord or daemon prince for angron,
Kharn as kharn,
two units of terminators,
10 khorne chosen for kharn's buddies,
3x 10 khorne marines for the bulk of the army,
15 zerkers for the apex world eaters,
havoks for the long fangs (teeth of Khorne?)
and a helbrute formation for the dreads.
I struggle on representing six Juggers, and honestly I think having this many detracts from their impact as they are meant to be rare, I guess I'd have to settle running them as khorne spawn or bikers.
Anyway, best of luck to the
OP and I hope you enjoy your army using the
SW codex, don't let anyone tell you not to do what you want with your hobby

.