Because we are duplicating every single part. Well not really, but we use the BOM along with our companies proprietary inventory control software to track everything. Not to mention I need the BOM to track which parts I need to model in CADD for fabrication. If my company needs to invest several hundred hours building a BOM manually, we are prepared to do so. It's just cheaper to buy a finished one from some one who has already done the work. We've already done as much for P-51 and P-47. But we will do anything we can to save time in the process, even if it's just finding a parts list with descriptions that are already digitized we can import.
Also, there are no BOMs on the drawings, they have parts called out with arrows, but no tables of parts or quantities.
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