Great bunch, Batt. D. I'd mustered with them once. Pretty good impression in the photo given the date, before reenactors really started to focus on the smaller details. Anymore, with the internet access and all, it's harder to excuse small inauthentic practices now. There's so much period imagery available online to compare one's legacy unit appearance with.
Of course most of the tents should be "A" tents, and the mountain howitzers were maybe a concession since the event is way up on top of Michigan's U.P. Perhaps their larger guns would have meant trailers and gas, meaning more trip logistics, time and cost. Batt D is a Southern Mich. membership in large part. I applaud that for years they had made this event one of their signature events every year.
In those days of reenacting (and sadly still some reenactors today) many Union and Reb units employed either red braces, or more obvious, red shirts for their unit. Not at all authentic, but hey it's mainstream and I've never heard any of those boys claim it was a standard in the actual legacy unit they represent. btw, I've seen units with half-red or all-red kepis as well, and I still see units with loads of hat brass, another "reenactorism."
As a CW musician, I admit I started with a dreadnaught guitar and bluegrass style banjo, though now romantic-era guitar and a minstrel-style banjo. You learn this stuff and then you work at affording it.