Allow me to explain your ban.
We were on a large raid, and we found you to be using the, as you put it:
metal gates you can give a material to so that people breaking in can't see you
In the old rules, they were permitted, but as it clearly says at the top of the MOTD:
TREAD CAREFULLY
We've changed a lot in these rules, most stuff has generally stayed the same but I advise that you read from top to bottom just to become acquainted with the new rules.
That's in
big red letters buddy.
The reason you are banned is because it would have been so easy for you to have destroyed the experience for the 10-15 people we had in our little raiding group using such an OP mechanism, and as you have appealed, you have your explanation.
These fences are no longer allowed, and I will advise that you do not use them again unless you wish to be in this exact same position.
I suggest that you read the new rules, however, you have been unbanned.