Steel Guitar Forum - http://bb.steelguitarforum.com/index.php
It costs $5 to join if you want to post, but it's worth it if you're serious. Steel guitarists tend to be tinkerers, there's more there about building amps and guitars than there is here, probably. Tons of access to instruction, too. It's a small community, so people like Buddy Emmons & Paul Franklin post there - that's the equivalent of asking a question on a guitar forum and getting an answer from Leo Fender or Jeff Beck. I've bought & sold more used equipment there that anywhere else, cause you'd
better not screw up....
Here's from a SGF link:
http://bb.steelguitarforum.com/viewtopic.php?t=149340
http://www.gregcutshaw.com/Tab/LapTab.html