HV electrical - control

After ages I succeeded to get a thick transformer from an old X-ray device. : mosh:
Thick grey box with a lot of oil. Looks promising.

Is specified for 150 kV at 4 mA continuous load, so approx. 600 W, 400 V at 10 kHz,
I have to also find the wiring diagram: it is a push-pull flow transformers. I've attached the plan.
To explain:
P1 and P2 are the primary connections. To see two are galvanically separated pairs of coils.
These are placed over connections P91-1 and P91-2 on Earth. It is so a
symmetrical voltage of +-75 kV. Graetz-Gleichrichtungen are connected in series then,
the push-pull-flow converters make out. The 220 MΩ resistors are used to measure
the high voltage of a voltage divider


Now my problem: as secondary testing  I the thing? What do you think of these suggestions:

(1) Wiring diagram Zer hacker, so as the following picture shows with a Tl494. Maybe not ideal, but would there go?

Primarily, I have rectified 325 V mains voltage.
You could forgo the freewheeling Yes, because the current locking the transistor on the
Secondary side commutes - or would it still kill the MOSFETs?
Half-bridge or full-bridge. What do you recommend?
Do you know a suitable driver IC? I got a few IRF 740 (400 V, 10 A) as MOSFETs.
I'm trying to find the wiring diagram for the control, which is designed for this transformer just extra.
Who handled with such high voltages, should in my opinion also the circuitry for master ;)