my 2c after playing over 500 hours and over 7k hours in other games from this genre :
Infamy system :
Offline raiding is a big problem in other games, I have two suggestions on how to combat this in hurtworld...
one : keep c4 rare, but introduce a seige weapon as the main form of raiding that is very very loud and very very slow to use, ie something to bombard and hit a wall with that takes 10-15 minutes to break a single wall, the loudness will attract other people and make the raiders fight for that raid.
two : make c4 common to craft, BUT make bases immune to c4 outside of 'purge time'. Purge time would be a set time period once a day/ week or whatever during peak time. IE a time everyone knows is the time you can raid. This will make it so everyone can raid, but you are stuck in the dilemma of 'do i defend or go out raiding, do we split our group into two forces ... etc etc' Maybe even have an ingame alert when the first wall breaks 'Warning you base is being raided' for people who choose not to defend. This will basicly make it so during the majority of the time the game is how it plays now, people farm and build, and pvp outside their bases ... then purge time its all out war.
Loot crates :
N00b biome :
Bases and farming :