Working on a project that connects to mains

[Richard Crowley]

Re soldering vs. crimp and wicking in stranded wire: I believe the NASA/aeronautical standards require crimping for its superior vibration resistance.  And proper gas-tight crimping produces a connection at least as good as (and typically superior to) soldering.

While I agree with all of the points made previously about grounding. Note that none of them are effective in non-conductive enclosures such as the OP shows.  In this case, the only conductive point that is vulnerable to contact with mains power are the transformer mounting screws. I would have connected the green-wire safety-ground to the transformer bracket exactly as the OP shows.

[Ian.M]

No.  NOT exactly as shown.  There aren't any extra fixing holes that could be used to give the transformer a separate earth for its core, so as a minimum use a Nylock or other type of locknut + a Belville or wave spring washer so the ground connection remains effective even if some idiot tries to turn that mounting screw without opening the case.   The IEC power inlet fixing screws should also be grounded, and unless the rear of the connector is shrouded, they should also be locknutted as there is a significant short-circuit risk if the ground wire to them comes loose and it and the socket are flapping around.

Fortunately there aren't any metal bodied toggle switches - grounding them (or other metal bodied controls) safely in a plastic case can be a royal PITA.