I am not opposed to you installing the PullP. By all means go ahead, and let us know how it does. I have seem some guys do it and it is cool. Also it is a great plane to learn the basic pull-pull set up on. However don't expect to have a noticeable weight savings. I installed a OS46 in mine and the CG came out at 4". Perfect for flying for me. I neither added nor subtracted weight from the build. This is also with a pilot figure. For guys that use larger engines they will often wind up placing weight in the tail anyway.

Take some pics as you go. And take your time. Make sure the lines are parallel, if you haven't done one before.