There is at least one member here who has installed a Predator engine in a cranbrook, so a huasheng will probably fit. The rear wheel should be ok as long as you properly install the rear sprocket and it doesn't interfere with the dust cap. I installed a rag joint on a cranbrook wheel and tried to modify the dust cap (on the coaster brake assembly) to fit. Either modifying the dust cap or possibly improper re-assembly of the hub caused the bearings to fail. The wheel itself is fine, just make sure you re-assemble the hub properly. You'll need more than just a coaster brake. Your options include front and rear rim brakes, which can bolt to both fender mounting holes, and you should use a dual pull brake lever to control them, or just a front rim brake but you may find yourself going through pads quickly. There are also drum brakes and discs. Drums are easy to install, you just need a wheel that has a drum and you can use a bracket to clamp the brake arm to the fork. Disc conversion is going to be more expensive. You will either need a disc compatible fork, which will cost about as much as a wheel with a drum, plus a disc brake wheel, pads, rotor and calipers, or you can use an adapter plate on a non disc fork but you will still need all the other components for the conversion. Drums are cheaper than converting to disc. Good luck with your build.