Well again I would say why rig some crap that, if it works as advertised, will get you 35w... I am powering over 50w of lighting and if not regulated will blow that easily. Magnet wire is cheap and your brain is as valuable as you make it. I got a spool of wire for 8.50, a 150cc scooter rectifier (not the 50cc, those are half wave) for 9 dollars shipped and made the bike do what I wanted it to do.
The only thing you will find with the trail tech or a reg/rec like the one I have is that it needs a battery to charge or you get low voltage. Unregulated I can power 2 25w bulbs and 3.5w of LED to about 18v before I back off. With the reg/rec and no battery I never get higher than 7.5v~