My advice is you look for renaisance polish - russian - hussites - steppe nomads like. The catalogue is a good way to surf into units for searching proxis
http://sg.tacticalwargames.net/forum/index.php?topic=4118.0I suggest something like this:
Knights: This is based on polish winged hussar form XV-XVI century. It is as easy as take that reference. Pendraken has two references (the original and now a second pose), also irregular has this item.
Horse archers: here you can put everything russian or mongol. GW has the steppe archers, pendraken has horse archers in the renaissence polish range, TB line has a beauty range of mongols.
Bowman: TB line has great mongols archers on foot. I recommend use the streltsi of Great Northern War - Ok they have arquebuses and not archers, but I think they work very good for kislev missile weapons.
Axemen: Here I go also for miniatures of 18th century again for the Great northern war - not the regular ones with tricorn but the levy troops. I need to see more figures, because I do not have a code entry in mind.
Bear: wolves are a possible proxi. But lets see if Eureka or pendraken makes our day.
War wagon: Hussite warwagon