You will pretty much have to have molecular resolution!
There are thousands of (and maybe many orders of magnitude more) different types of ion-channels - the basic unit of electric transmission in neurons. Unless you can identify what types of ion-channels are located throughout the neuron, you will have no hope of reproducing its function.
How do you propose to translate channelpedia into a complete functional description of an observed brain?
Or is the idea to somehow make a working model of the "average" brain inferred from a patchwork of bits of high-level aggregate data mined from various papers and originally gathered in many different contexts?
yes, that's a good start. also, nothing beats actually algorithmically reconstructing data from image slices http://3scan.com/ or setting up NEURON simulations.
There are thousands of (and maybe many orders of magnitude more) different types of ion-channels - the basic unit of electric transmission in neurons. Unless you can identify what types of ion-channels are located throughout the neuron, you will have no hope of reproducing its function.