I still don't want to rewrite 4 different rule sets front to back every time I get a new idea that seems to have wider application and I still want to have as many shared mechanisms as possible so that I can leap from 1 game to another and still remember how to play with minimal use of reference sheets which I misplace constantly during games. The new proposal, if I can work it, is to have a balance between shared and specific concepts and language. Where possible common rules, such as command control, will be written in as distinct paragraphs using shared terms so that can cut and paste whole paragraphs if there is a major change. Game specific paragraphs will contain as few as possible direct repetition of or reference to common rules so that one change will not require a cascade of changes. I prefer having everything cross referenced and in specific language but it has been a pain whenever I have made changes and inevitably references get missed. Maybe, when the rules have each gone 5 years with no change, I'll come back and make them more user friendly.
So, that will leave me where I started with 4 separate rule sets that share some common methodology but each with distinct elements.:
Gathering of Hosts for fairly generic Ancient/Medieval//Fantasy games using indivisible units.
With MacDuff to the Frontier for single figure Horse & Musket/Rifle games, primarily for Table Top Teaser type games with forces normally ranging from all arms detachments of roughly brigade size up to division size. .
Hearts of Tin (HofT) for slightly bigger battles using battalions with 3-5 elements as the normal unit and armies of Division to Corps size.
The Square Brigadier. My version of a small gridded game inspired by Bob Cordery's Portable Wargame but with mechanisms based on HofT.
If all goes well this afternoon, I intend to take a few hours of hobby time tonight and tomorrow so perhaps a small game and some typing time.