Yes you can do it this way. Just make sure to properly rate the resistor for the voltage and power (I recommend highly overrate it). Because in case the resistor fails short circuit (which might be rare but it's possible), then the resistor will blow your bridge.

Also id like some feedback on the MMC capacitor connections. Mainly what would be the optimal way to connect the 3 series strings in parallel and connecting main leads to them.
And what would be the best way to cool such a heatsink? I was thinking of getting some 80mm fans and blowing air trough the end of it.

Two posts above demonstrate a familiar misreading of OBIT and NST nameplate values.
For those internally-ballasted transformers, nameplate gives Open Circuit kV and Short Circuit mA.
In normal steady state operation, the current is close to nameplate value and the voltage is less than 1/10 of nameplate value.

For resistive loads, the maximum output power is reached with about 2/3 of nameplate voltage "at" about 2/3 of nameplate current.
On NST reported by Hysteresis, that reduces the maximum V*I product from 900 W to 400 W.   
Freau formula gives 51 inches and 34 inches for those powers.

[edit] Here's a report from 4hv forum, characterizing a 15-60 NST with resistive loads.  I got up to 425 watts out with nominal primary voltage.
https://4hv.org/e107_plugins/forum/forum_viewtopic.php?p=1&id=182849
That was near end of calendar year 2018, as 4hv orbital decay approached the critical point. Wow, it's been 5 years since then!