Thank you!
Yeah, so it's not cheap. There's a lot of cutting on this one, so a lot of machine time. For comparison, SendCutSend quoted me for the standard chassis plate, $68.85 in qty of one in 5052 aluminum 0.100 thick. They have a cool instant quote feature just with uploading a design file. So that gives you an idea of what you could expect for something simple like holes resized or moved around. But, suppose you wanted the standard layout, but in C110 copper 0.125 thick. That quotes at $352.31.
My custom chassis plate is 5052 aluminum 0.100 thick. The cost was $356.74 (less tax and shipping). If I had ordered my design in 1/8" copper it would have set me back $679.57. I thought about it, but that's both more than I wanted to spend, and because its thicker it would have required an increase in the minimum feature size, which would've changed the look of the art.