Re: lowland Scots troops. I've used the "Mercenaries" box to do some Scots; admittedly the household retainers of Bell the Cat, so probably considerably better equipped than most, and would most probably have access to blackpowder weapons. However, there are sufficient "unarmoured" bodies in amongst it to represent your common-or-garden "sodjer", and most importanly, pikes! (Lots of pikes!)
Plan A was originally to do the Army of James II at Roxburgh (mainly as an excuse to do lots of cannon and arquebusiers, and mangle a metal figure to represent the unfortunate Jimmy 2.0 after his inspection of the artillery...), however, it's sort of morphed into it's current form as something intended for gaming Sauchieburn (once I find some decent references...)
very much a work-in-progress...