gphil the LT 40 will not handle an engine the size of the DLE 20cc gas engine. It is designed for a much smaller engine.

If you want something that will handle the DLE 20 gas engine you are looking at something like a big Telemaster the 8 foot one. I don't think they are made in kit form anymore but you might find a kit in the classifieds or on an aution site.

A big stick is not a bad plane to learn on and there is a cutting service that does one here http://www.lazer-works.com/misc.html that would handle a gas engine.