Using Unreal engine projects for Crowdfunding

Hi

I am new here.

I create game packs and sell it on online stores, these are assets, game maps, characters and animations.

I am learning unreal right now and will be selling on epic marketplace as well.

I am currently working on a book on games where I am talking about all the major game engines and will mention unreal too.

For that I will be creating a crowd funding campaign and those who buy my book, I will give out game asset packs as perks with the book.

  1. Now for mentioning unreal engine in the book will the royalty exemption apply?

Perks will include 2D assets as well as 3D assets.

Now I want to know if I make unreal game maps and give these as perks ( obviously at a low cost than the marketplace for the funding of the book), will the royalty exemption apply here or not? I will be giving the maps with whole unreal project as perks.

My issue is the funding perk will be like this : - book + other assets + 1 to 5 unique unreal game map projects containing unique assets. say for total of $50.

2)If I have to pay the royalty, will it apply on the total cost or after deducting the book and other assets price ( for only the unreal maps)?

3). Say if I sell total perks of $50000 out of which unreal maps constituted only $4000. So 5% royalty of 4000 comes to $200. FAQ says UE4 is free to use, with a 5% royalty on gross product revenue after the first $3,000 per game per calendar quarter from commercial products.

So unless I make minimum $3000 per game map, royalty is exempted ? or the total earning of 4000 from all maps will be used for calculating royalty? Basically each map will be considered as a different game or not?

Bump can any staff member help me out here.