small version for 1:43 cars(Siku Racing)

[isopix]

Hi,

When looking on your PCBs with microUSB connector, they look huge. Speakers are even larger than your PCBs

I have collection of Siku Racing cars (1:43 scale)
I don't need anything, beside engine sound(lights, etc) But wonder if such board+speaker would fit if there will be installed IR transponder already:
It's using 3.7V battery, and DC motor is controlled by voltage (not PWM).

There are some pics for scale:
http://www.miniz-forum.de/siku-racing-mercedes-mit-robitronic-transponder-ausstatten-t26876.html
http://www.miniz-forum.de/userpix/3786_Mercedes_SLS_2.jpg
http://www.miniz-forum.de/userpix/3786_Anschluss_1.jpg
http://www.miniz-forum.de/userpix/3786_IMG_2390_2.jpg
http://www.miniz-forum.de/userpix/3786_IMG_2394_1.jpg
http://www.miniz-forum.de/userpix/3786_IMG_2395_1.jpg

and vid with transponder soldering:
https://www.youtube.com/watch?v=N1-xgpxS_rg

I do wonder how your board compares to "DasMikro Das87 Tiny Programmable Sound Unit"?

cheers