I've tried big bulbs in little housings in the past with no success at all. After having multiple 100W bulbs turn all black & blue after even just an hour's use (even expensive high-quality ones), I finally realized the halogen bulbs themselves were overheating and cracking from being confined within such a small housing (there's just no airflow inside there). I had to go back to the 55W ones and no more problems. I ended up getting bigger lights and then 100W bulbs worked fine.
Anyway, I've been watching your build for awhile now and am totally diggin' the ingenuity going into it.
I'm curious to see how the wheelbearing grease fitting works out for you. The driveshaft painted like that I'm not so sure about though