Home-designed variants of LEGO’s own official 42043 Mercedes-Benz Arocs truck set are popping up all over the place at the moment, and this absolutely enormous 4-axle concrete pump is easily the biggest, the most complicated, and probably the most amazing variant we’ve seen so far.

Built by Brickshelf’s waler, this remarkable Technic model faithfully replicates the huge truck-mounted concrete pumps that regularly service the needs of entire construction sites*.

Featuring remotely controlled Power Functions drive and 4-wheel steering, LED lights, a tilting cab, a V6 piston engine, motorised out-riggers, rotating pump arm, and pneumatic compressor for the pneumatically raising and extending boom, Waler’s Mercdes-Benz Arocs is one of the most technically advanced builds of the year.

There’s an extensive gallery of over 40 superb images available to view on Brickshelf – join us there in amazement by clicking the link in the text above.

*Just like your Mom.