It would be used 90% indoors in club nights and hall partys. I thought about G subs but didnt really fancy the idea as i doubt they would be that great in the long run if you decided to expaned or in a big link up etc. Maybe ill will look at them again.
To get an idea of how well those cabs will work for your choice of driver vs the original design spec you should compare the frequency response info for both drivers and also check to see if the cab designs and the driver freq responses are complimentary
Get the info for the cabs and the drivers and see what it tells you. If you are struggling then post links to the info here and PM me and I will take a look. I may take a few days to get back to you though 😉