Topic: FVK "simply the best" power train options and installs

Hi my FVK "Simply the Best" glider has been spending more time still than is fair for such a nice model so I'm looking into sparking the existing glider fuz but realise its a bit of a squeeze or at least it was pre micro RC gear, brushless and lipos.
Unfortunately queries to FVK reveal that the roomier electro fuz on longer available 

So any suggestions regarding power train prop motor controller and battery and RC gear layout that fit would be appreciated as the limit to my electric knowledge is limited (used to fly F3J before it turned into F3B!! and 100inch before it turned into a want to be F3J one model event.. i mean WINCHES!!! ...sorry ranting ) to a bit of fun with my parkzone Ember! and all the talk of watts and cells turns and propsizes is making my head spin!

I don't need expensive hottliner performance just enough so the launch is perhaps viable for UK F5J height limited events, after a car crash last year my collar bone plays me up after a few javelin launches so a spark up would give my little bird a new lease of life 

Rob