Main Rules Book: Put everything you need to play the basic professions and game. It's the main rules and geared towards newbies.
- Basic Rules
- Basic Races: Human, Elf, Dwarf, Halfling/Hobbit, Gnome, etc.
- Basic Professions: Warrior, Rogue, Thief, Mage, Cleric, Illusionist, Dabbler, Magent, Paladin.
- Profession Base Spell Lists and limited Open and Closed lists.
- Basic Weapon Type Tables (Broadshord, TH-Sword, Shortsword, Dagger, Hammer, War Mattock, Mace/Club, Morning Star, Bow, X-Bow, Staff, etc).
- Basic Critical Tables (Slash, Crush, Pierce, Fire, Cold, Electricity, etc)
...
Character Law:
- Background Options (Talents/Flaws) including general guidelines for creating new ones
- Possibly additional Races, Training packages
- Separating Race and Culture Adolescence Skills, Talents and Abilities.
Generally I like the setup you posted. But my suggestion would be to adapt it as follows:
Rolemaster Lite-Reduced number of professions, e.g. Fighter, Thief, Magician, Cleric, Bard, Ranger
-Reduced set of skills
-Reduced set of races
-Reduced set of spell lists and only to 10th level
-Simplified attack tables, critical tables & weapon stats
-Perhaps some kind of simplified skill development rules
-Simplified campaign handling rules
In the end this looks quite similar to the good old ME RP, doesn't it? And it should. IMHO an entry product is needed which people don't associate with the old complex Rolemaster. And once people get to like it they can see whether they want more detailed rules and buy some of the other books. But it should be possible to perhaps only buy the Spell Law books and the Creatures book and stay with the simplified combat system and char development until level 50. Just as well as people could buy Character Law later and switch to the complete skill list and the more detailed (normal) RM character development.
Character Law in this case would contain nowadays RM skill system as well as the complete list of characters, background options / talents, races, cultures (some more extraordinary races & cultures could be reserved for later books). This could be similar to the RMSS core rules and would be the main rules book.
A new player/GM would most likely first buy RM Lite (just as people often came to RM via ME RP in the 80s) and later, if he likes the system, buy some of the other books and "upgrade".