Bit late on this.
Building on some of the other responses I would suggest the following:
Firstly build an OLTP data warehouse schema. So a fully normalised schema for instance with
Customer joining to customer address table
Customer joining to customer_group table
Customer joining to...
Currently the DW has standard dimensions, for customer and product these are Type 1 SCD.
Mini dimensions have been created for changing hierarchy data on these dimensions (Type 2 SCD).
E.g. For customer the mini dimension is:
Cust_bus_hier_sk, cust_sk, <Customer Acc No, Cust Group, Business...
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