This is a pleasant surprise - reenactors of this period in America. Pretty new by the look of it, I am guessing they are experienced reenactors as they seem to understand the benefit of getting things right at the outset. They have a
Zouave unit (see above for explanation) and some Prussians. I hope this grows as it's a period that has been neglected. Go to their site and get involved. Links are useful too. I hope this catches on in the UK.