Shipka,
I am working on a set of stand-based rules that will have two bases per unit (in order to allow some basic posture and formation things), so the number of figures won't matter. However, one idea behind what I'm doing is that to be able to use the figures for other systems.
As far as the basing convention, I went with base sizes that could easily hold three 28mm figures (for infantry) with a bit of dispersion between them: "2.5 x 2". For guards, I will mount four infantry per stand so that they stand out. I also put a strip of metal on the back so that I can affix magnetized information markers.
I intend to put cavalry (two per base) on slightly deeper stands (depending on the figure size): "2.5" x 2.5". Cavalry will also be two stands per unit.
Guns will probably go on cavalry sized stands (to accommodate the size of the gun models). Unlike cavalry and infantry, though, an artillery unit will only be one stand.
Having said all of the above, the basing I'm using should easily give you enough stands to play any number of the DBX 19th Century variants (Kepis Rouge, for instance). You can find a list of those here:
link
Also, this system should work with the half scale version of Bruce Weigel's 1859, which I own.
Using each stand by itself, these would also work with Volley and Bayonet (2/3 scale).
Best,
Ed