The height of the models is 30mm. 

I provide walls with lengths of 25, 50, 75 and 100 mm, but according to the attached photo, it is possible to make your own side panels. ATTENTION the coupling does not always have a bottom 0mm from the perpendicular wall, but there is approx. 3.5mm to the perpendicular wall (ie eg when using a 25mm part and insert into the couplings there will be a gap approx. 32mm between the horizontal walls) 

Printable without supports.