Does the TB currently have power locks? If it does, then you can very likely get the remote keyless entry added on, unless there is something very special about the TB, and I'm not sure there is.
If you don't have power locks, then it's a lot more tricky. You'd have to get that added first before you could get the Keyless entry.
As for the door being vaccuum sealed. All doors are hollow and have little water drains at the bottom of them. They're not sealed off at all. Water goes in through the windows and runs out of the holes in the bottom of the door.
If you don't have power locks, then it's a lot more tricky. You'd have to get that added first before you could get the Keyless entry.
As for the door being vaccuum sealed. All doors are hollow and have little water drains at the bottom of them. They're not sealed off at all. Water goes in through the windows and runs out of the holes in the bottom of the door.