[Edi]

The way I see it is very much like tka outlined above, but with a fairly big emphasis on summoned units. Low level, low quality in large quantity much like the Gana available to Lanka, with some more powerful but numerically fewer summons.

Relatively few recruitable troops. The commander ideas tka threw around would be fairly ideal. The Kalevala people would probably all have forestry too, or almost all of them. Väinämöinen, Louhi, Ilmarinen, Lemminkäinen and some of the other characters would make for a wide cast of heroes, but you'd need to have several hero dependent events. Väinämöinen and Lemminkäinen in same province would probably be detrimental to income and cause unrest, maybe also something else. Väinämöinen and Aino (Lemminkäinen's sister) in the same province = Aino dies. And so on and so forth.

But making a Kalevala nation would be VERY work intensive.