I don't know these generators enough to give a full advice, but mind that they might have bigger issue than just the lack of mobility models.
If they have not been constantly updated to the latest ns-3 developments... the scripts MIGHT look right, but they'll require a lot of effort to BE right.
My suggestion is to just write your own scripts, or use a generator but add the missing code manually. You'll need to modify the code anyway because... see above.