Neurons are much more complicated that that, and indeed may do computations on their own.

I am not sure of the relevance of that here, especially as the issue is not whether a computer could be made from neurons. My point is that the premise, that the mind is a result of neurons interacting, is not predicated on a requirement that each individual neuron has 'consciousness properties', whatever they might be. I cannot see how the computational abilities of neurons invalidates my analogy to silicon computers, where the computational properties are only found in aggregations of the basic building blocks, and not in the basic blocks themselves.

Also, it seems quite plausible that an aggregation of semiconductor junctions could have the same computational abilities as a neuron. This is, in fact, an active area of R&D.