I have made a customised functional version of Thera for personal use. It keeps the basic vision of Thera intact but with much new added.
If your interested pm me for google drive link.
I changed so much over the years that I simply can't write it all down here so I'll list some highlights:
Tons of new and revamped units from a variety of great mods
Most melee infantry units have officers and officer guards
All factions revamped to some degree.
Better combat animations (more effective spearmen, no more awkward slow shield swing from swordsmen etc)
Better gunpowder unit animation, no double reload glitch (so more effective gun troops)
More emphasised factional strengths and weaknesses
Regional/factional specific mercenary units recruitable in small numbers in many areas
AI more likely to make armies built around their core troops
Changes to unit stats across the board (also taking battle model appearance into account for armour stats etc)
New loading pics
I'll add some screenshots later, unless this is verboten.
Edit: Screenshots