I don't know if this has been discussed, I never really read discussions too much any more.
All I know is that I've figured out a viable explanation.
Being one of the richest men in the world and having a widely-known conglomerate, Wapol has made a name for himself. He's gotten the attention of many, and possibly the world government and the scientist Vegapunk.
Wapol House is the most logical way (right now) to conceive these bizarre weapons that have "eaten" devil fruit. Since Wapol is technically more machine than man right now, it makes sense that the devil fruit haven't affected him in the way Jabura has said (they'll blow you up).
Plus, this would be a great way to introduce Wapol back into the mix.
If this has been discussed, let me know so I can close this thread. But I think it's fucking ingenious.