So my recent frankendell went well. R10 Ryzen with 5700X cpu oem ram.

https://www.userbenchmark.com/UserRun/53156508

First problem there is no I/O shield to remove from R10 Ryzen Edition.

Not an issue.  Why because the I/O shield for R5 R6 R7 on ebay fits perfectly.

Aurora R5 IPSKL-SC_IO SHIELD

Next issue is the usb ports and audio.  I suspect the Front IO piece for the R5 5XMRX works here as well but I havent tested it yet.  Both USB and audio can be bypassed with specific pins Jumpered I think same as 8930 project.

XPS 8930 Case Transfer Project 

I purchased a full R10 front panel with power button and audio and usb so that I can bench test this theory once I get the parts in.

Power button LED is NOT same as R10 board