RE: Giant Super Sporster engine....
Based on the DLE30 forum, the engine is just not reliable enough and may have some issues..?
The Zenoah is getting out dated but would suit well for this plane. Maybe look into the Syssa 30 or MLD 28 as well. There is always the OS 160 glow or the Moki 1.8 or Supertiger or some of the bigger 4 strokes like Saito 1.80 -2.20 or YS