Being an instructor as well as a test pilot for many a plane in my 38 years, I will ask to see the inside of the plane before flying it. I agree you can't everything but at least you gave it a look. I also ask about the CG and it's location, a simple finger pivot check has saved many a plane. If I am assisting a student from build to flight, I have him or her mark the CG on the wing or fuse so all that might fly them have the reference. We all know we tinker with things, even though we don't need to, can make a difference in the next time out to fly. How many times have we had a student tell us I did this or that, why because they can and will. We all do it.

The 28 is a great flying plane as all have said here. Take the time to go over it again, make the changes recommended, tell your test pilot what you have done and if he is not sure, look for a new one, or go for it yourself. Have another pilot that might have better skills than you stand by you to help set trims if you are not comfortable. Taxi a lot, high and low speeds down the runway to get her feel, before you know it she will be in the air and you can feel good about her flight. Treat her like the lady she is and she will do all you ask including the landing.

My 2 cents.

JimO