Do you have a good powdercoating shop in your area ?
I use a Methylene Chloride vat to strip the factory finish then media blast and powder with a color basecoat then a clear powder topcoat. If you strip them to bare aluminum and then clear powder, you won't be happy with the finish. Clear powder over bare aluminum darkens the color significantly. Better to use a silver base then clear top.
Your local guy will know all of this if he's any good.