I mean, can you even continue with the way the minecarts currently are? I don't think you've gotten the tnt to the place it has to go and there isn't a way to get it there if you can't access the entire left side of the minecarts. This can probably be fixed if you go to the scripts and flip the switch manually, but I don't really know how to do that myself, so I can post your save on the discord if you want, since it's way more active than the actual forums.