Sure it will work, i put a 21cc in the nose of a Lanier Explorer 40 and it flew just fine, the balance was even right on with the 32oz engine in the front, other than the deadsticks cause i flipped the carb to make the throttle linkage easier not knowing there was a crankcase pressure line to run the fuel pump in the carb, the last deadstick did some damage on landing, i gave the plane to a friend and he now has a 26cc Stihl on it. I did heavily reinforce the nose with extra glue and triangle stock, i also glued another 1/4" ply firewall on top of what was there. There has been about 40 flights on this plane and it's holding up just fine. Here's a pic of it with the 21cc on it.

Warning: As usual this thread is in the beginners forum, please do NOT try a mod like this unless you absolutly know what your doing.