well, if you login to the server and your admin, the panel should already be in the admin group, so it might be your button or something...
Do you have CAP locks enabled?
ya, if you want to use a same int, then just copy the world object then drag it off to the side and do your thing
but if you don't you could still use any world object and create your own int.
If you want to create your own interior using the GTA Object,
Just make one...
You could set it in another interior/dimension to make it almost the same as the others...
That's easy