Yes. Many thousands of $$$$.
The only definitive answer you will get is from a rigging shop. A 70 foot cat is going to have some fairly sophisticated rigging which if not done right will cost many more thousands of $$$$.
The answer to your question I think does not lie in this forum.
By the way, welcome to the forum. We hope you will stay a while and have some positive inputs that we may learn from.
Cheers Cisco.