200W 400kohm resistor with polystirol resin:

100uA instruments for voltage and current measurement:

Circuit:

Maximum output voltage of the multiplier: 100kVDC.
Maximum stored energy in the capacitor bank: 150J
Maximum reverse voltage of the diode bank: 256kV
Resistor before the 100kV instrument: 1Gohm 60W
Changeable shunt resistor for the 100uA current meter
Resistors to increase the inner resistance : 400kOhm 200W

More details: LINK (hungarian)

Spot welder for the fusor inner electrodes: