How can you building in to a base that closed? and i haven't seen builders build bases, I've only seen them get them materials.
The reason Weaponsmith is prohibited from raiding is because your buddies get you in and you sell every gun in the base that your group does not take. It's unfair to the owner of the base.
The reason Explosives Expert is prohibited from raiding because any random player can switch to the role and with enough money, break into a base and get full gear off its contents in seconds. It's too OP of a role. Although nothing is to say Experts can't "Sell" To raiders.
Builders can get in and tear up the base. Make it into a shell, to the point where it is no longer considered a base. A builder can do this and set the requirements for it to be a base, but now it's theirs.
None of these roles can raid fairly as they all have an extremely OP ability for raiding that will ruin the fun of the server for new or old players alike.
I understand where you are coming from but I don't see this becoming a thing. Sorry man. -1
The moon is high, tear through the sky. Find your prey, make them pray. They shall pay, within the day. When all is clear, you will hear, the dark wolves howls.