I there!
I recently recorded a tutorial of sorts about form building and perspective.
It will be one of a series of instructional videos that will introduce key aspects about fundamentals and will furnish you with proper learning resources (proceded in a pdf the link to which you'll find in the video description).

I hope that this will prove useful to some of you.
Here's the YT-Link:

http://www.youtube.com/watch?v=25x7MuSrQGU


Let me know what you think.
All the Best,
René