Looking pretty spiffy, Hub!
Just a couple of (completely ignorable) observations. The shako plumes of the bearers should be pure white for 1st (Grenadier) Coy, the shako cords should also be white, the facing of the drum would be white and the officers sash would be the same darker shade as the Kings Colour. Also, for Waterloo, the Coldstream wore the more comfortable grey overalls, not the barracks whites.
In case you wonder where my references come from, I re-enact, 6 Coy, 2nd Batt Coldstream Guard 1815 so I have to wear the uniform on a regular basis and I have stood and defended the north gate against the French.