well, if you can write some missing description for sweboz, do it and present it to the team, i think they could be pleased of some help, or just ask them what are the currently missing areas you could help (expecially if you are good in english), cause in 0.8 they could be already done...

anyway i could suggest you to try one of the more finished factions like greeks, ptolemaics, seleucids etc... or an eastern one, in the East you can understand what is the real strong point of EB than other mods, there are nomadic champ, yanCai mercs, it is a real cavalry festival... the skin and the animation are beautifull, the map is large and the town are few... rebels spawning from almost everywere... few resources... a sense of anarchy and uncertainty that never make you feel safe.... i can only imagine what it will be with the bonus of Saka-Rauka and the new skins... no other mods has this strange feeling in the east...

regarding Sweboz, i just saw them as enemy, so i cant say about them, but from what i have saw, there are not comparable skins in other mods, some of the unit i faced with my Greeks, where magnific, i understand why the title of this mod is Europa barbarorum... they have done a great job with the Barbarian faction (especially with sweboz)...i really felt scared when my poor civilized phalangites had to face them, they seem also bigger in the body from what i noticed...