Remember the D2 connected in series is about 20 ohms, and CTS1200 only gives 300w in 16 ohms, but still its probably complete overkill for domestic use. Then again the network burns a lot of power (I recall POS calculated this in one of the M2 threads?), and it has apparently a very high power handling.
So yes, I think it is safe with the network in place, and a well functioning CTS1200 with all its protection circuits. If you are building a pure clone, there is logic using similar amps for HF and LF section. Unlike me who ventured into experimental DIY terrain with a different driver and low power class A amp for the HF.