Hi,
Time to complete the construction of the vehicle. Someone building this vehicle strait from the box can probably be finished in just a couple of days. My idea to make the fun last longer is by adding extras and try to improve a few things. Its not easy to find something to fix on this model.
As seen in earlier post, the M551 in Vietnam was equipped with a titanium add-on armor plate under the belly to protect the crew against mines. Other than some fuzzy pictures seen on the web, the wonderful book "M551 in Action" from Squadron Signal provides more information on it. Tamiya does not provide the add-on armor, although the bolts are present and need to be removed if the armor is created.

- M551 Sheridan Airborne light tank - Vietnam - build
The visible add-on armor section is easily reproduced in plasticard and glued in place. The Tamiya bolt heads were replaced by M1 brass bolts with a washer and screwed in place to hold the armor plate like the real thing.

- M551 Sheridan Airborne light tank - Vietnam - build

- M551 Sheridan Airborne light tank - Vietnam - build

- M551 Sheridan Airborne light tank - Vietnam - build
As suggested by Barry, a plasticard strip is used to fill the gap at the front of the vehicle between the upper and lower hull. A plasticard plate is also placed to represent the hull glacis under the viewing glass (used for the driver to see when the flotation kit is up). The glass itself will be inserted from under later after painting.

- M551 Sheridan Airborne light tank - Vietnam - build
The plasticard strip at the front totally fixes the gap issue at the back.

- M551 Sheridan Airborne light tank - Vietnam - build
The Tamiya engine grills are put on, a perfect fit. There must be something wrong with them for Voyager models to propose a totally new set of engine grills. Whatever extra they provide, I found the Tamiya grills to be acceptable to me. I would normally have replace the solid grill handles by brass ones in 1mm rods but they are located in a way that make the removal of the plastic ones difficult. Still TBD.

- M551 Sheridan Airborne light tank - Vietnam - build
While studying Sheridan walk around books, it is difficult to find something to add. A few bolt heads here and there. The searchlight cable hole in the hull can be refined. And when the searchlight is not put on, the wire connector needs to be plugged.

- M551 Sheridan Airborne light tank - Vietnam - build
The loader's hatch handle need to be replaced in brass. There is also a bracket over the hinge, supporting the hatch when open and providing additional support when the loader is sitting on it.

- M551 Sheridan Airborne light tank - Vietnam - build
As seen in references, two ammo boxes are placed inside the commander's cupola rear section on each side of the door for easy assess to reloads. I can't really see the commander stepping out of the cupola in the middle of combat to unfasten some ammo boxes strapped on the exterior side of the turret... For sure, some boxes must have been stored inside the turret as well.

- M551 Sheridan Airborne light tank - Vietnam - build
Continuing on following post.