I have the O.S. 160 twin on mine also, was planning on using gas but for gassers other than the RCS 140 you have to cut the cowl and I didn't want to do that to mine. There's a thread on the DPM cub...lots of pictures and engine choices.
http://www.rcuniverse.com/forum/m_20..._1/key_/tm.htm
Bud