An Overhead Lifting Pulley with Transverse Travel

One of the problems I, and anyone else for that matter, working alone and isolated, is manipulating heavy and awkward components that require multiple 'lifts' for lining up, checking and final sealing and locking into place.
An overhead travelling hoist would solve the problem but when one hasn't the room nor the lolly to get one of those then improvising as shown in the pictures is a way out of trouble.

A stout, rounded and very smooth piece of hardwood is attached each end to the over hanging joists ( in this case by rope loops) being positioned  transversely to carry the engine box  mechanism to the midline of the boat. This is seen top right in the picture above.
Rope from a balancing point on the box is looped a couple of times over the bar above and back to a make shift sheave at this balancing point forming a crude but effective pulley system as shown below. The bar and the sheave were waxed to enable sideways slide on the bar and slip of the rope over the relatively fixed centre of the pulley.

I can now lift the box clear of the gunwhales and push the rope turns on the bar across its slippery surface to deliver it over the centre of the boat single handed.
Having reached that point the system allows a very controlled lowering or raising of the box.