I kind of had a feeling the stuff would sell, and sell well. I would love to get my hands on one of those custom chip stand-ins just to have in my hands what they had to make to develop the Amigas when the chips weren't ready but I have a feeling they will be out of my price range.
I have a C65, and sold a C65 motherboard for almost $500 quite a few years back (going on 10 years maybe).
I also have some Amiga artifacts. One is a blank board marked A30000 Multi FPU board ZorroII which is a Zorro board with along its length two rows of spaces for 8 large square chips (which I assume are the FPUs) giving it a total of 16 this thing would have done math at a screaming rate for the time. My favorites are a C64 cartridge gutted, a A2k motherboard power connector put where the edge connector used to be, and a wire coming out the back with a 500 style power connector obviously used to power Amiga 500s from a 2000 power supply. Second is a board marked Amiga Romcard Rev 0 which is a small board with some chips, DIP switches, and a connector that comes off the back and has an L which brings it down to the bottom of the board parallel with it. Connector is about the width of the A500 expansion edge connector and the 2 ROMs are marked 2.0 but fewer pins than the Kickstart ROMs in a 3000. along one edge there are LEDs attached in a row to the board. No idea what that board did or for what.