I dont know how to make extend the brick, as I have only just began scripting today
RedWall1 = game.workspace.RedWall.RedWallPart1
RedWall2 = game.workspace.RedWall.RedWallPart2
RedWall3 = game.workspace.RedWall.RedWallPart3
While true do
RedWall1.Transparency = 1
RedWall2.Transparency = 1
RedWall3.Transparency = 1
wait(10)
RedWall1.Transparency = 0.2
RedWall2.Transparency = 0.2
RedWall3.Transparency = 0.2
wait(10)
end

2 comments
Could you explain what you want a little better?
My guess is that you want the .Size property. Remember it's a Vector3.