Not quite right , but close. You are missing a double block with becket (replaces the double at the bottom of your system) and a single with cleat, above which the double and becket are attached. All are then attached to the traveller car. The traveller system was originally separate, it anchors under the centre of the rear beam, up through the rollers, then through the cleat. the first photo above (white mainsheet) is how the original system should look. As you can see, it takes up a lot of space and is generally replaced by low profile triple blocks top and bottom.