Before anything else, yes, we will be releasing mod support on the final version, as we’ve said on our latest devlog :).
Regarding amounts, we are not sure of an exact figure, but we can give estimates.
We were designing about 9 new encounters and 3 bosses, besides some odd scenes. CGs go around 40$ to +100$, but if we settle at around 50$, each original animation uses about 120 CGs, which would go about 72.000$ for animations alone.
Of course we would cut this to about 1 or 2 CGs per animation and then animate them ourselves or hire someone to do it, which would land about 1.500$ if we animated ourselves or around 4.000$ if we hired an animator to do that from the CGs, based on a price of 50$ per scene (~4) for each encounter.