The pedestal box was made from 10 mm MDF. I used a paper template to mark and cut out the rounded edges. I didnt't install dividers or supports for the panels yet to make them exactly as I will need them when I know the measurements of the panels.
For the fire panel box I used 6 mm plywood. I installed wooden supports so that I could nail the parts together. The supports are placed 6 cm away from the top edge to have enough space to install the panels later.
To cover the rounded cut-outs I screwed a sheet of 0.5 mm aluminum onto the rounding using flat head screws. Predrilling is essential to prevent the MDF from splitting.