This is based entirely on the tarantula spider that was part of the LEGO Creator (then 'Designer') Set 4101 'Wild Creatures' that came out in 2003. The instant I saw it was black and red I knew I had to convert it into an M-Tron vehicle!
This was the result. Where are the magnets? Well underneath are two LEGO fridge magnet bricks and for about 18 months this was by far the coolest fridge magnet I ever owned. Unfortunately I needed to leg pieces to build the big zeppelin in the Adventurers folder and it was dismantled.