Looks like you've got the basics covered.Your brogans will work with the leggins just fine, unless you get involved with some serious stitch counters. You could add stripes to the CW trousers to go with the blue jacket you ordered. I'm not sure when the black campaign hat gave way to the drab one(I usually consult Drydock on these date things), but the Kepi will work up to 1895, when they changed the style quite a bit. Just change to the later style insignia(if Artillery changed, I don't know cause I'm infantry) I think your helmet would be goot for a later time frame also.
I have not ordered anything from them either. Simply gave link to provide pics of period shoes.
Sorry, I guess I missed that, they do have allot there that you can use for research, even though they're not the best to order from