How to Make Mp3 Speaker Box From Cheap Radio Fm

I have cheap and litle mp3 player that can be heared with headphone. I also have cheap fm radio operated with 2 AA batteries. I combine both mp3 player and radio to make a compact mp3 speaker box operated with 2 AA batteries.

From radio, I take a speaker and a pcb. I just use the amplifier, so I eliminated the pcb to fit the new box. use the stereo jack and solder the L and R channel united to connect to the potensiometer in radio.

Sorry I can make step bye step instructions ....I'm not good in english
I have a blog (with Indonesian Language) please use google translate  : http://www.mbahlatif.com/2013/03/bikin-speaker-box-mp3-dari-radio-murah.html
Take a look some pictures below...

Thanks....