Here is 18normal bricks.1half and 1big which is 1.5size of normal brick so this and that half size brick is like as 2normal bricks. so We have 20bricks. if he standing on 2wheels his bars are in height of 12,5bricks(bar height can be 100cm(I think it´s more).Well 100/12.5=8.00.......8,00*20=160cm. that´s my maths (anyway I think his bars can be 103cm or more because on my low end zoo" i have bar height 100cm high but then it will be around 165cm and it´s really unDamon IMO