RE: Moving engine forward changes geom'ery?
Did the reverse for the same reason. Shortened the nose 3" on an EAA Bipe by Balsa USA in order to install a small gasser. Had flown it with a 120 4-stroke in standard config. Did not notice a difference.
Go for it!
Bedford
PS: Darnit Sandman! I got smudges all over my expensive new monitor because of you!