It seems from all the posts on this plane that you should expect it to come out tail heavy with a .46 size engine so expect to add a little nose weight. I got mine fairly early so I found this out the hard way. The general consensus now seems to be to ignore the recommended firewall/spinner backplate distance (I did it per the book) and instead mount the engine as far out on the mounting rails as possible to avoid adding any more nose weight. Of course you will want to also do everything else you can to keep the weight forward like mounting the battery under the fuel tank and mounting the servos and receiver as far forward as possible. Do that and hopefully you won't have to add much dead weight to get it to balance out properly.