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BUILDING: Coils L1 & L2 are made on PVC pipe with diameter 63mm. They have around 950 turns of copper wire diameter 0,2mm and length is 215mm. Inductance is 12,8mH and you have to make them identical... It is best if you measure them on inductance meter. If coils are not identical, than in order to compensate you'll have to use different size of top plates. I use 80x80mm copper plates used in electronics for printed board. Bottom copper plate is 120x160mm... and size of plates is not critical... because they are only capacitors ! ! ! Coils L3 & L4 are flat with inner diameter of 66 mm. They have 12 turns of copper wire diameter 0,9mm and inductance is 21uH.