Yup, been tried, in a thread you posted in

[link=http://www.rcuniverse.com/forum/m_8808381/anchors_10083442/mpage_8/key_/anchor/tm.htm#10083442]Reactor bipe thread[/link]

Other than cowl/muffler fit issues, the DLE20 would be great in this plane. Plenty of wing area, and you'd end up around 8lbs. Definitely go with an IBEC/kill, such as the RCEXL from [link=http://www.valleyviewrc.com/estore/rcexl-opto-gas-engine-kill-switch-with-bec-6-6v.html]Valley View RC[/link] and a single battery to keep the weight down.