Make sure when you move the stick right the right aileron goes UP. Very common for beginners to reverse them, and even for experienced pilots to mess it up on occasion. Always check during the pre-flight.

Now that you've rebuilt it and added weight, possibly unevenly balanced, and the wings and empennage are possibly out of square, it is imperative to have an experienced pilot get it airborne and trimmed out for you. No amount of simulator time will replace that.

I did not, crashed repeatedly, and as a result gave up R/C for 18 years. Don't make my mistake.