Has anyone Double Belted their Machine

I was out and about the web and I saw an article about double belting his brand of machine. I was wondering if this has been done or can be done with x-carve

Many have upgraded to 9mm reinforced belts, I havent seen (IIRC) any doubled belted Xcarves though.

Doubt there is enough space between the idlers and the rail for another belt, but I have not checked.