Anyone Ever put an engine in their model?

The other day when I was working on my 1/10 scale r/c car
i found this little engine on the work bench - its about 3/4 of an inch wide
and thats where i got this idea

for the last week ive been modifying a 1/24th scale Dodge Viper RT/10 by Maisto -(preassembled diecast metal)

Ive been setting it so i can make it hold
the engine
2 AA batteries for the engine
1 AAA Battery for the Lighting system (which consists of superbright leds that look like xeon lights for the front and back)

so far i have
connected the rear wheels with a solid metal axle
made metal braces to hold it in place
drilled out of the base of the model a place for the axle to rest
made resting points for each of the batteries

the main point of everything i do to it is for it to not be visible from the outside of the model

anyone else ever attempted anything like this?

See also: http://www.tinyimports.com

Ya thats cool
but mines not remote controlled
its just a direct tie-in to the batteries
so its full power the whole time
cool stuff tho

I would love to pick up some Mini Z's if they werent so dern expensive

I my just build one, All I need is another receiver, I already got a Radio thats good for 8 cars, and I got a bunch of servos and motors

anyone have any RC cars? I have

New Era chassis Tamiya ClodBuster
HPI Super Nitro Rally
HPI Micro
Traxxas E-maxx
2 Kyosho Mini Zs and a Brandless 1/24 scale remote control car.

I have a nitro R/C car but it is too expensive for me to maintain it, so I kept it aside :(
But I got another manufacturer like the Kyosho's Mini -Z, I got a NewQida Mini-Racer.
Play a day the the batteries go flat.. :(