Here is an Optimus Prime (self-robotized character from the film Transformers) which is 2.50 metres tall.
It is made of 5000 recyclable parts taken from cars, boats, a dishwasher, motorbike, television and other pieces of metal.
It still weighs 550 kg though.
Along the same lines as with Robost
This is a companion discussion topic for the original entry at https://community.robotshop.com/blog/show/optimus-prime-is-2-50-meters-tall