A simple enough head swop (eagle head icon someone elses work) from the un-helmeted original, power sword for Daemon weapon swop and a scope added to the storm bolter plus the addition of the SM Commander eagle-headed Backpack and Banner and finally a FW Skull Icon on the banner.
The sword can be used as a Daemon Sword (using WD 295(UK) rules for Relictors) or a Relic Blade or a Power Sword. But I know Aventine will be glad I've Daemoned up his weapon! Think it is originally from the WFB Chaos Marauders plastic kit.
My receipe for Gold is Brazen Brass, Highlight Shining Gold, drybrush highlight Mithril Silver. Works for me - simple enough.