A quick update:
I had a business trip for 9 days.
Today i got some time to continue winding the toroid.
It is not easy as the wire is very inflexible and you still want it nicely wounded arounf the toroid...
So, i am still at the seondairy....Its slow
This week again a lot of work, job related.
Next week, i hope to be able to put more time in all of this...
cheers!