This is perhaps the best How to build a cigar box amplifier video I have ever seen. If you want to learn how to build homemade guitar amplifiers this covers it all. This is a true build along tutorial starting from absolute scratch.
The interesting 20 minute video breaks everything down, from the parts, pieces, resistors, caps, soldering to the motherboard, every single up close step by step on how to build every nook and cranky to make a simple yet great sounding and unique amplifier made from a used cigar box.
This is a really interesting video and so well put together, watch it, I'm sure you'll want to give it a try!