Not a huge derivation fom the main fluff, but:

I had a Deva Artificer who, tiring of reincarnation, attempted to make himself either mortal or immortal. He set up various laboratories an support networks do he could continent his research in each life. He realized at some point that his want to abandon the Deva cycle was turning his hands backwards.

"Oh, dang. I'm, like, half rakshasa now. Dang."

So, he chopped off his hands, made himself some magichanical ones, and decided to systematically turn himself into a warforged.

It all came from the little flavor text for the rakshasa. I focused on the summoning bits of the Artificer, foregoing anything that was actually magical, and refluffing what I needed to.