I love unturned. It always was Fun and modded servers even more, but i really hated raids. Its easy to raid begining player. Sentrys makes only litlle bit more harder to raid, but if generator was destroyed, It was useless. If i wanted better survivability on base, i had to farm materials and made thicker and more strong walls.
So, there are some solutions:
Sentry upgrades a upgrade slots (for fire range, fire rate ect.)
More types of walls (like reinforced metal walls)
Bigger claim flag radius
Single player wasn’t my favorite gamemode. It was boring. NPCs are very interesting. They Dont attack ať you, you can do tasks and trade items. But no more.
My ideas to do NPCs more interesting:
Add bandits (they can Attack you and raid your base)
Add exploers ( they explore loot zones and seeking supllys)
Learn NPCs walk And shoot
Add Guardians (they guards evac zones and they shoots zombies, low reputation players and if they was Attacked, at attacker)
Other:
Set more offen rare loot
Add glass to the Cars
Add choice to create local or temporary server.