I've had a few attempts at 6mm fantasy wargaming over the years starting with large 6mm armies using Chipco Fantasy Rules 2! and 3!
https://6mm.wargaming.info/page1.shtml and then more recently I tried 6mm skirmish with Songs of Blades and Heroes (here
https://6mmwargaming.home.blog/2023/09/08/fantasy-warbands-for-sobh/ ).
Now I'm looking for some thing in the middle and going back to unit bases, but smaller than my original 40mm square bases used for FR3. I've settled on 25mm square bases which gives me enough space for a reasonable amount of figures but it means I can play on smaller table and with bigger armies. I also considered 20mm and 30mm sized bases but I could spend months deciding and still not be happy!
I still own the Chipco FR2! and FR3! rules and I recently purchased Fantastic battles so I'm sorted for mass battle rules. I can also use the figures for skirmish games with a base of figures replacing a single 28mm skirmish model.
I've rebased my 6mm Dragon Knights from Perfect Six onto 25mm and I'm working on my 6mm Wood Elves and Orcs, but I don't have enough of any for an army yet, but here's the first Dragon Knight units.
They are pretty hefty figures especially the foot so I went with 4 figures per rank and 2 ranks. I wanted them to look like well disciplined units so I based them in well ordered lines but for Orcs and others I make them more of an irregular blob shape on the base. The mounted knights I staggered in a slight wedge formation and managed to squeeze 5 onto a base and I'll create different formations with of my other foot knights.


They're not the greatest photos but hopefully you get the idea, and I'm happy with the result.