I think 60 is very possible with a .12. The weight of the boat and the type of engine are a big factor. I still can't say I have been able to do it, but I have come with in a few miles an hour with a NS5 NR. I was using a 220 and the boat weighed 1,150 grams with a full tank. I was also using a full heat sink with no cowl. If I had cut it down, I believe I would have been able to go over 60.Most of the 45s over here set up for heat racing easily go 65 to 70 mph. I agree with the fellow earlier in this thread. You should consentrate on making your .45 faster before you go dishin' out the bucks for a .12.
I sold my Hammerhead .12 on RCboats for 250 bucks. It has a .12 TR-PT that had tons of life in it, The radio compartment was only less receiver, and there was absolutely no damage. Wade is right. If you put your mind to it, you can build a new one for about the same.
I would avoid spending that much money on it.
Hammer