I remixed this Anet A8 power supply cover with 80mm fan from Ghrem who also remixed it from TNS and Bittig so thanks to those guys for the hard work.
I needed my switch to be located on the left as I have a different PSU and the 240v connections are on the left. Also I didn't want an additional LED switch or anything so I got rid of that.
This model fits and works very well.
I am using a 10A fused switch which is easily sourced on ebay or amazon.
2 walls and 2 top/bottom layers.
The screw on the left that is already in the PSU needs to be replaced with a M3 x 10mm (mine did anyway as the original M3 x 5mm didn't reach anymore).
The right hand side screw is a M3 x 15mm with a M3 nut inserted in the cover.
The screws holding the fan on are M3 x 20mm which fits perfect so that the screw doesn't hang out through the nut and contact the PSU frame.