OK, I moved parts from my breadboard to the Pi PC board. I don't have enough of the correct value resistors for the HF attenuation circuit, so I improvised. What I have is a total of 30 Ohms (single 30 Ohm, jumpering R1B) in the R1 position and 14 Ohms (2 paralleled 20 Ohms to a 4 Ohm in series) in the R2 position. Let me know if I did anything stupid.
I will order Mills resistors in the correct amounts and values so the crossover will be able to handle full rated power. At the moment there is no chance anything will become warm.
I used silicon under the permanent components, as Wayne suggests.
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