Ikea Jansjö - alternative wallmount case for clamp led

I use a Jansjö clamp led since several years as a reading light. As the clamp is not big enough to be mounted on my bed directly, my work around was a small piece of wood screwed on the backside of my bed. It worked but it is not elegant and I do not like the cord switch neither. Therefore I decided to rip off the clamp from the lamp itself and the switch.

I designed a slim box which can be easily screwed on the wall or backside of a bed etc. After printing the two parts of the box (Typ A or