thanks for reply pete.
Now I'm not sure what material is my sheet. It's not chrome, that's for sure, it was pretty rusty when I pulled it out from pile of garbage in my basement, besides chrome isn't magnetic. As for laser, I don't have access to it, but there's local company that has it and it's not too expensive. Take a look at what they made for me in wood, it's my ross compressor pedal Link
My blade is also 10cm deep, but my first idea was to put coil(s) away from strings, like this. Also, Idea was to make stacked design with two 4ohm coils. Should I make 4 leads like on humbucker pickups and then just connect two of them or just solder two coils directly to bobbin and make 2 leads going from pickup?
Now that you said that I consider cutting blade to about 5mm and moving coil towards strings. That would also mean not using pickup cover because it adds about 1mm to the distance between coil and strings.
I noticed that my larger ceramic magnet (from those cheapo humbuckers) won't attract my blade on it's wider side (like this), but on narrower side (like this). I'm little confuzed by that
Cheers