The Great Planes "Patty Wagstaff" plane is good however more posts on this site seem to point to the Dave Patrick plane as being the better choice. Haven't flown the Extra but just sold a Great Planes Giles which was built well and flys well. The 50 cc engines would probably be too much for this size plane. With any ARF it becomes difficult to install an engine on the existing firwall that has a rear mounted carb (such as the ZDZ you mention or the new DA-50). If you are building a plane and plan on the firewall placement it isn't a problem. For this reason you may want to consider the BME or Taurus for an engine selection.