Thanks EasySteve!
Skunksmash - I agree with you there - I've seen some impressive bodywork skill displayed on this forum and a lot of it does seem a little more than backyard hobbyist level.
As far as where I got the kit from - It was actually thanks to this site. The member Liddy71 to be exact.
http://67-72chevytrucks.com/vboard/s...d.php?t=538362
I happened to be browsing the forum while I was stuck in a work camp in northern BC, and came across Liddy71's post.
Just the right place at the right time - and yes, it takes up pretty much all the space behind the seat.
I'm definately going to have to get an underseat woofer for the stereo when I start work on it. I can fit my jumper cable bag behind the seat, and that's about it.