old raft guide

I have a WTT Fusion large helicopter, it was great fun but now the electrics are toast. It is in great shape , nothing bent or broken. I would like to convert it to a 2.4 GHz system, what would be the easiest and cheapest way to do this? I have several 7.4 v lipos to use. Can I do this by buying a receiver, esc and maybe a gyro? I,ve looked at several parts and can do it for About $30-40. It has a coax rotor and is about 27" long. Am I wrong to assume I can do this with those parts, Is there any special needs or additional things I may need? I pretty sure the motors are ok, but could I go brushless as a possibility also? Any advice is greatly appreciated.