Frederiek,
As others have stated, "English Walnut" should be available to you", as it appears to be available on the other side of the pond. You have a bolt on possibility as well.
It would be great to have you in the build off this year. You do wonderful builds!
Let's do this. We still have time. Keep looking for pieces of walnut that suit your needs. If you can't find what you are looking for, I'd be open to an exemption, but lets exhaust our possibilities first.
Lets revisit this in a month.
In the meantime PM me the dimensions you need. I may have something.
@Frederiek
It's almost a month, so I was wondering if you have made any progress on finding some walnut for the build off

