What are the acceptable fee structures, deposit and withdraw limits and unit increments when setting up all the assets in the HollaEx Kit?
What do you mean by acceptable? You can customize pretty much all the values in the admin panel.
Refer to this https://docs.bitholla.com/hollaex-kit/customization#initial-coin-values
You can change these values anytime through the admin panel once you set your kit as well.