those things are like gold bullion in our neck of the woods...and if it's a pop-top Westphalia edition name your price!

For the water heaters, the newer ones often cannot have a thermocoupler replaced, it requires the entire assembly so harder to work on and more money. 

https://www.courier-journal.com/story/money/companies/2019/08/29/ford-motor-co-invest-millions-louisville-kentucky-assembly-plant/2124179001/This is actually pretty important because their is always a threat of the unioning calling a strike.

@Arlan Potter - the sales tax exemption is also used for components used in assembly.  

You can potentially have your building built in a factory and shipped and assembled in a few days.In terms of your duplex situation, I think it depends on the neighborhood and also if you're looking to rent both or owner-occupy one side or sell.  

Although it wasn't anything major it still shows how the faucet suddenly became the sink and drain assembly as well and combine that with the fact that the sink cabinet was so small I could hardly squeeze into it to work on things as it was.

As far as I'm concerned, the glass may be thermally good, but when that glass is placed in a sash, and that sash place in a frame, how well does the entire assembly perform not only thermally, but at keeping out air movement?

I think all together I have a good team assembled for flipping houses!

If you end up looking local, tell the agent you are not a buyer, you are an investor looking to assemble a team.

You're sending your drawings and tech requirements to a manufacturer in China, they make a house for you, ship it to your location, you hire a crew to assemble that house in your place.