I plan making a new Flare mod using HD graphics soon.

Planned is a new campaign like the current, but with some changes. A different story, maybe combine the character class (ranged, adept, brute or how they are called) with the skill system, where you can decide in the game what you want to be and different characters starting with different stats.

I don't know where to start, I know about another flare project / demo that uses HD assets, but I don't know if it uses a different engine version.

Do I need to fork the engine and make bigger modifications to the engine?? Also I don't have any experience in flare modding right now.

Before making the campaign I want to experiment with modding and making some sort of demo mod, including some test maps.