DIY ESS - Fan hole enlarged for more air flow

After monday night tests, last night I drilled a big hole to get the hot air out

I drilled many small 2.5mm holes next to each other and cut the metal

not perfect, but it is well opened now

and after testing at full blast, it really dissipates the heat geenrates by the 7 chargers or the 8 grid tie inverters; Now I will have to find a grid protection for this opening ...