Can we agree that the following would be considered a compliant method to wire from the panels on the roof to DC control box, to the inverter ?

Lets use a 460 watt panel (6 panel string)as an example within 15 m of the inverter:

1/ 4 mmsq double insulated red and black solaflex with a 4 mm earth pulled into a 25 mm PVc conduit inside the roof space, to the PVC trunking, down the wall to the DC control box, fitted with a double pole 32 amp DC isolator, 30 amp (1000VDC) fuse holders with 15/20 amp DC fuses and PVT2 20 ka (40 ka max) SPD.

Pretty much the standard configuration seen in 10's of thousands of installations. Personally I have never seen a domestic installation with metal wireways, I am sure there are.

If the conduit is on the roof exposed to the sun and subject to mechanical damage, then maybe you would consider using metal wireways, however then you need to consider the heat on the metal.

You would also need to consider damage to the wire if the installer has not deburred the wireway or used tex screws to attach components.

Because bonding is so critical, you would need to install earth jumpers between all the metal wireways and make sure the conduit has earth straps or clamps.

If you doing what 99 % of installers are doing with the earth wire, running it from the roof down to the DC control box then the inverter, then down to an earth spike, rather than directly from the roof to the earth spike then back to the DC control and inverter. As we all know if lightning hits the metal, it is going to take the ................................................ path of least resistance and boom, kiss you inverter and all the electronics devices goodbye. Thank goodness for insurance. Some might say the SPD will protect the equipment. I wish they had when it hit my house.