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I usually follow DBx basing if I need to put mulitiple models on a base but you basing solution looks good. Who makes the highlanders?
For what it is worth, Beneath the Lily Banners infantry basing is 45mm frontage and 50mm deep. If you went 90mm by 50mm then you would essentially be "legal" in that system.
I have the same figures and when they float to the top of the painting queue, I will be doing them individually based on pennies, and using the Warbases 6 & 8 slot sabot bases, so they can be used for Sharp Practice as well as other 'element' based style sets. In all likelihood, I will be doing both sides, so as long as the bases are compatible, no problem.
I am using Beneath the Lily Banners as a guide, with 3 60x60mm bases per battalion, although I use 5 instead of 6 figures per base (will count as 6, when using BtlB). That will be my Standard size for Black Powder (4 bases, large; 2 bases, small). The reason why I use 5 figures is because that my collection for the '45 is also Flag of War Miniatures, which are large and with very dinamic poses; 6 figures look a bit cluttered to me, besides using 5 figures I have the added benefit of saving time and money!I know that 3 bases look too small for some people, but my table is not that big (6x4), therefore I need to optimize the footprint of my battalions. Actually, I intend to reduce by 1/3 the distances used in Black Powder, to fit it to my table. I have done the same for games set in the WSS and it works well.