Sounds like a solid approach.
This is what came to mind.
I move the harddisk to the far left and rotate it 90 degree. The cable facing to the front of the machine.
I can make a metal plate mounted to the plastic on three corners to the housing of the machine and one corner, the lower right, rest on the tinware.
This way the harddrive sits directly above the power circuitry. I will need a longer cable fot the harddrive to achieve this.
What do you think?