Bom for inventory database

Brief summary: I am an access developer, but need help with a bom database. I have an inventory database in MS Access 2007. It manages inventory for computer parts (it works very well). I also build new computers from parts. I want the database to include a BOM structure and code to manage the computers I build from parts. The BOM would need to calculate the price of a new computer using the prices of the parts and correctly calculate the stock on hand. ? I prefer someone with knowledge of BOM, or someone who can demonstrate their understanding of working with the bom structure. I will supply the current table structure, queries, forms, and code. You will make the necessary changes to the tables. You will change current queries, forms and code and create new queries, forms and code as needed. I have guidelines about code conventions and set out, error handling, naming variables. I would like to pay on an hourly rate. I would like to review the work in progress after 2 hours and make suggestions or approve the current work. Then keep reviewing at regular intervals.