The current code contains a bunch of conditionals that basically does a rather basic operation -- which is to populate the master dict entries with either a user defined or default value.

One way to do this is to create a dict which contains all the relevant default values (in the right order, so that those values which depend on previous keys are defined). You could then call something like (in pseudocode)

populate_master_dict(user_defined_dict, defaults_dict):
foreach key in defaults_dict:
master_dict[key].value = user_defined[key].value or defaults_dict[key].value

For validations, you could also specify in the defaults dict whether something is required or whether it has the wrong format, and then spit out a message that has been genericised accordingly - rather than having messages for individual components.

this has been completed with the interpolation code.

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