I have to say- Projects like this are never cheap, nor are they easy
There comes a point where money becomes less of a determining factor, and simply being able to complete a project to see it through to the end is the motivation to finish. This is especially true when you've got a year+ worth of time invested into the project; that's something that is oft times not taken into account in the total spend, and that's a resource you can never get back. Besides... When a project is spread out like this, picking up parts here and there is a little less impacting in terms of cost; certainly not the same as paying that amount all at once. The total amount looks big in the overall picture, but when spread out, it's not so bad- Especially since we're talking gen parts here. And significantly less than the gen's $17k price tag.
Much respect for Marcus' work on this. Expensive? Yes. But exclusivity has it's price