I agree with Boots 100%. Whoever told you that you do not need a line filter has no experience with electrical work. You will need a line filter and a 275V Varistor. Easily found at Jaycar.
A transformer is required. The chassis requires 110VAC (from the transformer secondary) and depending on what type of switching power supply you have (110VAC or 240VAC), he power supply needs power from the transformer.
If the picture was fine before you started, you should not need to change your chassis.
