the kit you mention is for the usa vehicle, you can use many of the parts but you will need to get other parts or alter some of the parts.
It is however a good starting point for the conversion.
Courtenay use the z22se ecu which requires a 2 Bar map sensor, the usa vehicles use the usa spec ecu and a remap.
The fuel system only requires the z20let injectors to be fitted to your astra, the supplied injectors cannot be used due to the z22se ecu, 2 Bar map sensor and the courtenay mapping.
You can source the parts individually which will save you some money, but of course will take much longer to locate all the parts.