I want to go old school and use a 1.60 FX on this one. I was going to use a 1.20 but it ended up else where and then a DLE35 that ended up in a Giant Sportster. With a 1.60 FX the performance will be incredible. Almost as much power as a DLE30 but with less weight. Just have to put up with the slime.... I have to admit the 1.60 is about the best running glow engine ever. All the ones I have had anything to do with were superb.
The build thread over there started back around 2005 if I recall and it has many great ideas you can consider for your build. Many people have contributed over the years.