Well, i have no experience with this particular buggy. Im not sure how good of a brand Acme is, but hopefully it will hold up well for you
There are some simple things to remember while messing with it. I would put blue loctite on all the metal to metal screws. This will keep them from vibrating out. Take your time with it. It takes some time to build a kit, so just work by the manual and it should go pretty smooth. I would put some after run oil or something similar down into the plug hole on the motor, and the carb throat before you ever start it just so you know that it is lubed up well for the initial start. Make sure your gear mesh on your motor is good and snug, but not tight. You want to be able to freely spin the spur by hand without it binding, but you also dont want it too loose. You will strip a spur fast if the mesh is too loose. Make sure and loctite the engine mounting bolts once you get the mesh correct on it too. Im not sure if you have to build the differentials or not, but make sure they are shimmed as tight as possible so that they dont bind any, but also dont have much play at all. Just get them as tight of a mesh as possible while still being able to spin them freely. If they are too loose they will strip easily. Too tight, and the motor will struggle because of the resistance. Dont get too carried away with screws going into plastic parts. They strip fairly easy, and i am bad about putting too much on them and stripping them out.
Over all, it shouldnt be too hard of a project. Just take your time and enjoy the build[8D]
Eric