The chassis brace very likely would not provide any appreciable increase in chassis stiffness due to the design of the EV battery location.
I think the spring and shock absorber rates of the SE are much better than what my
ICE Cooper S was. The added weight due to the batteries, and the lowering of the centre of gravity.
The strut tower brace would serve better if it was triangular from tower to tower to firewall.
It is worth noting the video presents for an ICE Cooper and the chassis and clearances are significantly so I would take its advice with a grain of salt.
I would also ask what you motivation for the mods. Is there a discernible difference in handling to be a achieved? Or is it for appearance.
The SE is not well suited as a track car. Aggressive driving on a track will very likely result in high temperatures in the battery pack. Cooling capacity may well not match that heating and the software will reduce power to protect components.
I am not saying that mods are a big mistake but I would urge you to look at these possibilities critically. The SE is not the same creature as the ICE models.
Mike Wazowski [emoji1063]
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