i did this in 2009 to my sportbike when it was still a street bike.
i ended up taking the OEM regular halogen headlight, and retrofitted a Xenon 2005 Nissan 350z projector into the headlight. took a week since everything is complete custom fabrication work.
i ended up making about 4 more for forum members, and sold them successfully. from what i know, they are still in use today and working fine.
would i ever take on the project again? probably NOT for the low-beam lol.
but certainly i would for the high-beam. i actually like the light out-put of my stock HID headlights. the high-beam could use a little work. or i could simply use the (upside) low-beam block off plate inside the projector for an extra low-beam.
this is what my original stock headlight looked like:
everything apart on my kitchen counter:
finished product:
