We all have our moments of insanity.
I really DID consider converting the RC to d20. My design notes included...
Returning to the old stat system (13-15 +1, 16-7 +2, 18 +3)
Simplfying the skillset into 10 or so broad skills, which are Max-ranks/half-skilled by class.
Classes: Fighter, Cleric, Magic-User, Thief, Elf (like duskblade), Dwarf (slightly different than fighter), Halfling (similar to ranger), Mystic (monk). PrC-like classes for avenger, knight, paladin, druid, bard, and some special demi-humans.
Upwards AC, Three Saves.
Limited Feat Use, mostly using the system to represent combat styles/Wpn mastery
Stripped Spell Lists
However, I realized there is no real point to going backwards with D&D, so I abandoned the project.