I spoke to Courts about it a few years ago, they said they could do the SE in the Vec C but never have done so don't have and info/maps and so on. As for the YH, i don't think the CAN would be a problem as its the same as the pre facelift SE in that department but as Vocky mentioned it would be the Manifold. The other problem I think they have on both cars is the angle of the engine, in mine certainly, its tilted quite far back so the SC would sit quite high up front and I think there might be clearance issues with the bonnet, nothing a big hole wouldn't sort LOL
It would be nice though to shut up a few of the VXR online guys who presume just because you dont drive a VXR your beneath them, Vec C certainly, cant comment on the astra chaps however.