Well, the model was originally flown on an OS 160, which is what you see in the pics (chris putting it through its paces). The UK distributer, Daniel Roser of [link=http://www.freestyle-rc.com]Freestyle RC[/link] is also using an OS 160. It can also be used with an YS 140 and the 160, which i can tell you all is one heck of a motor (turns an 19x8w, and ooh so smooth).
However, ive gone for somthing slightly more enviromentally friendly

Hacker Power!
To be a bit more specific im going to be using a Hacker C50-14xl Acro Competition. This is a top of the range motor, best money can buy, for 2m models, all the top pattern pilots use it. It comes at price, but when added up against a YS 160/hyde/haitori setup, its about the same. with 10s1p Flightpower 5000 packs, and a 22x12 prop, i should be pushing 2.5Kw!!! hopefully all that power will be helpfull as an E setup will weigh approx 1kg more than the IC setup (dry), about 2lbs.
As for small gassers, personally i wouldnt reccomend one, but if i did have to, a ZDZ 40 or a Evo/MVVS 45 MAG (magnesium casing, much lighter), both with lipos on the ignition
More details and pictures soon!