I'd start by either building up the slides with weld and blending it, or machining a new double slide.
Since it only has one seer and the 2 triggers are only about a 1/2 inch apart the idea of 2 triggers is stupid, or lazy design work, I'd reduce it to one trigger centered and a normal size trigger guard.
But it would still be nothing but a curiosity using 2 single stack mags and a ridiculously wide grip.