Paul, those bathroom locks look very nice and will probably do the job better than the purpose made bonnet pins as they will naturally line up the level of the back edge of the bonnet with the bulkhead without any need for adjustment.
One thing though, do you have access to the bulkhead beneath the female part of the latch so you can fix them in place with nuts and bolts? If not you'll maybe need to use rivnuts as self-tappers are likely to work loose.
Keep up the good work, the chequered flag is in plain sight now. Painted by the end of next week then? ...
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