Sounds to me like this might be going to DVD, in which case you can still export at 24fps (dvd players will convert the video to 30fps on the fly).
If everything looks good, then press on. But make sure you’re looking at it on your final delivery format. For instance, if you’re going to be watching this on a TV, make sure you try it on the TV before you decide all is well. If it were me, and all my footage was at 24, I’d definitely be editing at 24, and doing any converting to 30fps further downstream. This gives me a lot more options later on.