You can get an LT-42EP ARF.. But it's not the same size as an LT40.

I bought the LT40 kit, built it, and converted it. Thing I would do differently.

1. Mount the ESC under the motor in the engine area. I added air scoops in the fuel tank hatch, and again after the wing. This allowed air to enter and exit the fuselage. It also added weight. If I had it to do over again, I'd do that a little differently. A little creativity and it would simplify the built and electric portion of the build. And make at-the-field battery changes a bit easier.

2. Build in some kind of battery arming switch. I have to remove the front hatch, connect the battery, and reattach the hatch. A switch or something on the outside of the plane would be handy. And safer.

3. Possibly build it as a taildragger. I had issues making the front wheel steer well. Making the tail wheel steerable is tricky, and you may not want to undertake such a mod if this is your first build. But it would make the mounting of the ESC a lot simpler.