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Any hints about winding the coils? I've read at some place that you use 800 windings each coil using 0.2mm wire. Because someone note, that 800 did not find and he uses 650 instead, I tried with 700 as starting point. I build one coil and tried to put cover over it. This was impossible. Next I tried with 600, but again, it did not fit. Last try was with 500, but it will not fit all 8 together.

So in my opinion, 400 would fit. Any ideas how much power I get out of this with 400 windings?

How many windings did you use?