Hi, you have chosen a very good plane in the Mid Star. I built mine as a progression from my LT 40 trainer around 5 yrs ago and still occasionally bring it to the field when I want a relaxing sport plane to shoot some touch and goes. I have an Evolution .46 mounted on it and it is a nice size engine for this frame. Your OS 46 fxi from the Nextar would be ideal.
I would like to make a suggestion to you about the tail wheel. Do not use the tail wheel wire that comes with the kit. It mounts directly to the rudder and puts a lot of strain on the rudder hinges and servo gears, especially when flying from a grass field. I used the factory wire when I first built my MS but it was quickly torn from the rudder when I bumped my plane rearwards while starting the motor. I have now switched all of my planes to a Sullivan tail wheel. They are far superior and will save you some trouble down the road.

Good luck and have fun.

Trav

Here is a link to the Sullivan tail wheel.


http://www.greathobbies.com/productinfo/?prod_id=SUL860