@cryptomosk in the voskcoin discord just shared some interesting resources that readers of this thread wanting to take the DIY route may be interested in.

https://www.schneier.com/academic/paperfiles/skein_fpga.pdf
https://pdfs.semanticscholar.org/0a17/1dd3eade8688cecc255bfd16b9f8cfe62cd3.pdf
https://www.sciencedirect.com/science/article/pii/S1877705817300577
https://ehash.iaik.tugraz.at/wiki/SHA-3_Hardware_Implementations