Dennis,

I built one more than 15 years ago and I still have it. It was the second kit I built and I did not find it to be difficult. There were a lot of hours involved, though. That is a plus to me, as I like building.

The 70 will be submarginal unless you spend quite a bit of time holding weight down. I flew mine on an Enya 120 and it was great - over powered, just like I like it. It now has a small gasser in it.

I made a number of mods to the design when I put the gasser in. I shortened the nose by 3 inches to account for the higher engine weight. The design can stand a much shorter nose, but if you are planning to use a 70 or 90 4-stroke, I would leave it. I also added ailerons to the top wing. This made the world of difference to the flight capability. As designed the aircraft is soft on aileron. With them on both wings it is very crisp and nimble. If your intent is to fly scale-like, stay to the design. If you plan to fly aerobatics, modify. It is a very easy mod.

Have fun with it!

Bedford