I'm working on building units for the 2nd Seminole War. I chose 28mm and started by getting some New Orleans Greys as US regulars and will make another unit using their US deserters. Next I need to add a cannon or two. I'm leaning towards using howitzers from 1st Corps' Mexican-American War line, but I'm on the fence about using their gun crews given the discrepancy. Also, I'm staying away from the Old Glory line if they're in fact 25mm.
What have other people used for artillery and particularly the artillery crews for this period?