We've recreated the mobile suit that appears in Moon Gundam with the HGUC Sazabi. 
The "MSN-04X2 Sazabi Early Test Type (Gravity Specification)" is an MS that appears in the manga Moon Gundam. It is said to be the specification used during the test of the Sazabi. During the test phase, the cockpit was located in the chest, like the Geara Doga and Jagd Doga, but due to insufficient output, the generator had to be strengthened, and in order to save space in the body, the cockpit was moved to the head in the official version of the Sazabi. As a result, the shape of the chest and head differs from the final version of the Sazabi. It is also equipped with a long rifle as armament.

Sazabi Early Test Type Wind | GPO144's Gunpla works