Cover for junction box

This is a cover for a junction box from the swedish company Biltema, with the brand tp electrics. I designed it in Tinkercad and it is my very first 3D design, so please don't judge me for all the design flaws.

Here is a link to the junction box: https://www.biltema.se/bygg/elinstallationer/eldosor/kopplingsdosa-2000034324

The size of the box is 185x115x75.

I haven't printed the whole cover yet, but I'm test printing a corner of the cover at the time of writing.