I thought I would add my 2 cents as well.
I have built three of these kits over the years.
They have all flown very well. I keep building them and end up selling to guys in the club as a second plane.

Very fun sunday flier.

As for engines, my last one had a Royal 46 abc. This was more than enough power. Due to the soft aileron stock I had flutter problems coming out of power on maneuvers. I plan to build another on one day and will probably add light weight servos in the wings and cables back to the rudder.

I also got a TT 42 GP for the next one. This engine should be a perfect match for a balance of power and a little lighter engine.

If you just follow Sig's excellent instructions, you can't go wrong.
Good luck.

Hoops