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Ever so many thanks Larry!
Your reply helped a lot. I ran the piece through the thicknesser, after first resawing it on a table saw. Both worked very well; only the very needed extractor got its hose clogged up by the chips – well, they were more like shavings rolled together into narrow straws. Nothing to it but to do without the extractor. Thankfully, this activity didn’t take place in the workshop, but in what was once a cowshed, at a beneficial temperature of just above freezing.
Working with the acetal plastic has been quite pleasant, while at the same time really intimidating. You mentioned ebony; my thoughts have been on bog oak. There’s no texture, it is homogenously black, and it will be very difficult to get a new piece, should failure be the outcome. Even cutting off a test piece felt a bit.
I used a 5 mm brad point and a 6 mm thread. The flat head screw went down as if through a metal thread, but there never was a really distinct stop to turning. Supposedly, that means that I should use longest screws possible, several of them, and stick to the flat heads?