If you look into your washing machine, you'll find this pattern, it's the safest. On that bolt you can attach some lugs with a nut. If you have no other choice, you should attach a (copper) bolt to the chassis, and attach it to the chassis in a way that can never get loose. Safety ground may never be connected with a screw, because a plain screws gets often loose over time.All if this is just to prevent a non working safety ground in case of human errors. Additional the chassis connection from Part A and B (and others) should be with a wire. If you would ground everything on Part A, this risk is eliminated, though it costs some more wire. The risk is now, if the wire from A to B is bad, this can become unnoticed, and everything connected to B is not grounded anymore. Then, on Part B several safety wires are connected. Then, to that part (A) some other safety ground wires are attached, and one of them goes to metal part "B".
A typical mistake is described like this: The safety ground from the AC inlet is grounded to a near by metal part called "A". This means, each safety wire must still work, if another one has a loose contact. For this reason, safety ground wires should not be cascaded. Keep apart the safety ground and circuit ground.Also don't make an issue about two different colors connected together, this is normal. Besides there is no need for a unique color scheme, since we usually ALREADY know we are working on DC heated filaments, just we don't know what is plus or minus. Also when building, you are going to see that you can't always do it 100% right as the number of available colors is not enough. There is no official standard for this anywhere, so this here is just a good proposal.
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