Republic to Empire.. quick history...
Our group the League of Gentlemen Wargamers needed a very fast play, big scale Napoleonics ruleset. I used Under the Lily Banners as the basic building block and developed them to suit Napoleonics. They are:
1. Just as fast
2. Easy to use but also
3. Particularly focused on Napoleonic tactics, formations and weapon types.
I have never made them freely available because as some point I hope to publish them. The have had more revisions in two years than ULB has had in 4 years. I am on Version 9 now.. also modifications as a result of play testing.
They can be used with any basing configuration. Your battalion sizes are quite OK. Clarence and I are seriously considering this as the next project which would not take nearly as long as ULB/BLB for the following reasons:
1. Already written
2. Heavily play tested
3. Process for transfer to a commercial product already proven via ULB.
Once BLB is launched and I get a feel for whether it stands on its own two feet commerically I'll make the decision on the Naps rules. If it is not a flyer then I'll probably make them freely available via the site(but I hope not