While I have tried to remain true to the source material, I likewise indulged in a bit of artistic license by adding certain elements of my own design, including: the Murvani (an elaboration of the Gypsies from the Ultima series, including a brief glossary of the Murvani language), several breeds of horses, a custom calendar, a system of tarot cards (based on the Ultima lore, but lacking illustrations), and others additions (all listed under the Book of Lore section). I have likewise expanded upon certain other elements of the lore. I have attempted to incorporate rules for each installment of the series, though I must admit a personal preference for Ultimas IV and V.
I have likewise provided a character creation system based on the Origins (Races and Ethnicities) and Professions of the various eras of the Ultima series, as well as several organizations found in, or based upon, organizations found within the series or hinted at (or listed) in Ultima Online. GURPS: Ultima includes rules for various systems of Magic, including an attempt at a relatively faithful amalgam of the various interpretations of Magery found throughout the series, consisting of eight circles of eight spells each, for a total of 64 spells.
In creating GURPS: Ultima, for the sake of simplicity, I decided to utilize only the 4th edition Basic Set and the 4th Edition Magic sourcebook.
There is ample room for improvement and expansion, and I have created a forum for this purpose, as well as as a sounding board and gathering place for fans of Utima, GURPS, or both.