The afghan regular army did exist in the 1880s and fought alongside the more commonly known tribals. I find it interesting to have them in red while the British are now in khaki. Some had a type of kilt on and had Highland units. The beehive hats make a nice change to turbans
At the battle of Maiwand the British were completely out gunned by afghan artillery dispelling some colonial war myths. The artillery units have a very European look and did a lot of damage to British units that had to stand for a few hours at Maiwand in the firing line