Finally, after an almost 5 months break, I managed to start to work again on my 7-string guitar project - in the last two days I spent about 10 hours filing the alu front plate to put the pickup, knob and jack input... Quite a minimal guitar indeed, but still the humbucker is splitable with the push-pull knob. And since on all my guitars I mostly play on the neck pickup with the treble on 11, why should I bother with extra stuff?
Anyway, tomorrow I should get a machine to polish the alu front and then I'll put the neck and the bridge...