I built the LT-40 as my first plane from a kit and it came out great. If I can go it so can you. Not nearly as hard as it seems. Great choice for a trainer also. The LT-40 is a real floater too. Had some engine problems with mine and got so good at dead sticks I almost had to relearn to land under power. Point is that plane is so easy to fly and build. I would go with the 46 engine because the 40 is just a little small for that large wing on takeoffs.