True, without knowing the condition and appearance of the exterior you can't know for sure about the expense. But if the exterior was in poor condition, I would be concerned for the structural integrity of the silo, given their typical construction. I don't think I would like the aesthetics of cheap exterior siding on a silo (or anywhere, really, but especially on a silo
)
And you are pretty much guaranteed to have to finish the inside if you don't want to be looking at rough
concrete or steel walls...