I added some reinforcement to the fenderwell mount by sliding some plastic strip under the frame, and glue strips above it. I started to the second frame by glueing the plastic strip to the top magnets....

...and then gluing strips between the floorboard and the plastic strip.

It works perfect....

...and is hard to detect.

You don't have to solder the wiring, you could twist it together and then use heat shrink tubing and tape. But I reccummend soldering it.

Here you can see where I glued the circuit board for the on/off wire to the back of the interior tub (black arrow). The red arrows point out the dashboard wiring.

I wanted the pull cable for the cars emergency brake to be the on/off wire (black arrows) so I glued it around the interior tub to the front of the tub.

Here you can see where I've twisted the dashboard postive and negative (red arrow) onto the power source wires.

I made a solid "Y" shaped block from scrap plastic. Drilled down the center for the on/off wire (red arrow). Than drilled the two sides for the e-brake cables that come from each back brake.

With the interior tub glued into the body we can now just the head/tailight wires onto the power source.

With the battery in it's holder I trimmed the case to fit snug in the kits gas tank.

A quick on and off test before I mate the chassis and body for the last time!

It works great and adds a ton of realism to your project!