Hi Basil, was this conversion relating to the Tiger Trainer 40? If so, I have the same uncompleted model bequeathed to me, but I plan to replace the ICE to Electric also. What motor/ESC/prop/ batteries did you end up using. The model came with a 10x6 prop but from what I have seen on other sites more like 11" or 12" is needed, but this may cause issues with ground clearance.
In summary, if you are willing, I'd be interested to know what you settled on and the level of success you had.