And generalize it so the underlying framework can be used in other areas, such as manufacturing, where you need to estimate the time/cost to build an assembly, which is itself composed of other subassemblies. Then have the ability to store those subtrees separately, so if you're estimating a new product with some subassemblies you previously estimated, you can reuse that data.

That's a product you can actually sell to any number of small manufacturing businesses worldwide.

HeyLaughingBoy, that's an interesting idea. I'd like more details, but your public profile has no contact info.

Sorry 'bout that. Deleted the old email and forgot to add new one :-(

Updated now.