So there are these modifiers that you could use a triflash bracket and use it to build a large modifier.
Typically one would need radio triggers for each of those.
I'm wondering if it's possible to just have one on a radio trigger, the others on optical slave? Being inside the modifier, it should have no problem sensing the initial impulse from the one on the radio trigger.
Though I kind of have my doubts - the light output might be more like 1 speed light and then two speed light...