G'day

At 27 years of age, you are not too old and not too young and should find learning to fly not too difficult. I started at 40 and I did find it a lot harder than my then 12 year old son. He was taking off and landing in less than 3 months while I took about three times that long to do it the first time and I was still learning the finer points 10 years later (and still am 20 years later).

The PT-40 is a good kit to build. It was the second kit I ever built back in 1989. Mine was powered by a Thunder Tiger GP 40 which was more than enough for it. So an OS LA 40 or 46 would be fine. The standard version has quite a lot of dihedral which makes for a stable plane which is a bit untidy in the way it flies. You can also build it as a "sport" version (details are on the plan) with reduced dihedral (the angle between the wings). If you do build the sport version it will be more fun to fly but less stable. But, and it is a big but, if you do build the sport version, you have to supply your own wing joiner ply wood pieces. So if you do go this route, make sure you use really good quality plywood to make the joiners. The PT-40's wing is quite thin and the joiners also are quite thin and need to be proper aircraft grade ply. If you use lite ply, they may fail. My model was damaged and I used the wrong grade of ply when repairing it and this led to the models demise. Lite ply is just too weak for wing joiners.

Have fun

Michael in Oz