Pavel Jiránek's Merkur Clamshell Digger

Pavel writes: "This is my next model built from MERKUR. This clamshell digger looks familiar with steam shovel excavator. There are a few photos. Of original clamshell digger and my "homemade". As you can see I used chassis with rubber treads (steam shovel has the same), which is powered by 4,5V engine."