Notice on the plans that you will be adding diagonal bracing to the fuselage on the sides of the longerons. I add diagonal bracing to the top and bottom of the longerons also. This help to stiffen the tail up tremendously.

Add ailerons. Some build the entire wing and then cut the ribs out and add trailing edge stock to the wing, then they add leading edge stock too the ailerons. I prefer to cut the appropriate ribs beforehand and glue in the trailing edge stock on the wing as I build. Then you just buy aileron stock at the hobby shop and your done with them. When you make the ailerons, instead of sanding the leading edges to a 45 degree angle; simply glue a piece of triangle stock to them. No sanding needed.

If you plan to really fly the snot out of this plane with a larger 4-stroke; then think about putting some flying wires on the tail. Kevlar is a nice light way to build the flying wires.

Make the plane a tail-dragger. The Kadet is a totally different plane on the runway when it is set up as a taildragger. You can use a Klett tailwheel. I use a Hitec HS-81 mini servo for the tailwheel. I run it out to the tailwheel with a seperate control rod and slave the servo into rudder. It works great and is totally adjustable with a computer radio.

If you do keep the stock nosewheel, get a dual strut "Faults" setup. Best nosewheel in town for a big plane.

Put the main tank under the wing saddle and run a small header tank up near the firewall. That way you can carry a bunch of fuel and use the plane for Long Distance fun flys. My friend put a 54oz tank under the wing and a 12oz tank behind the firewall. He uses a 3000mah Nicad pack and we can fly it non-stop for 100 miles. Still has plenty of fuel in the tank when we land it. He uses a Saito 91 with a 14-6, but we prop it up to a 15-6 for the long distance fun fly. That allows you to run the motor at less RPM and conserve fuel, while still maintaining 60MHP down the highway.

You might consider removing some of the dihedrahl from the wing. You can easily get by with only half of what the plans call for. Make a new dihedrahl brace from hard plywood and glue it in. You might consider bolting the wing on. That way it goes on the same way every time, and you won't have to fiddle with trims. Rubberbands are forgiving, but the wing will never sit in the same place twice. You'll have to trim the plane for each flight.

Reinforce the firewall with some large triangle stock, especially if you go with a large 4-stroke. Put tri-stock on the bottom of the firewall too.

Big bouncy Cub wheels look kinda cool on a Kadet.

Just a few ideas too get ya started.