Thanks Mark
I thought about making my own mesh now I'm using a drill press, this is a rough example on some scrap I did with a few different size drill bits, if I do try this I will mark the piece for a good guide and can get pretty close to where the pci slots are.
This is how close I can get to the pci slot area.
I had to come up with an idea for using the reinforced cutting discs as the hole was too big for my mandrel so the discs were cutting ok but shortly after went flying off, here is my beta .
The dremel fix works great and was able to do the whole psu hole and there is still plenty left on the cutting disc , only bad thing about the dremel in the summer is it heats up fast, when I did my last case in winter it could go all day and not get a bit warm, so I will have to come up with something to cool it down faster.
My dad said he wanted to use the garage so I packed and cleaned up for the day, so More tomorrow.