Here is a good place to start Reverse flow cooker painted and first cook
K.A.M made a real nice one, I plan to use it as a reference when I build my 500gal, good luck feel free to share some pic brotha http://www.smokerbuilder.com/
is another good place to lurk around. What are some plans you have for yours?
What I will build.
I have a 2006 16'' Tandem trailer $700 bucks on CL and what I need is everything else like 500g cost me $75 bucks, insulated fire box steel is what cost and 10'' steel pipe stack, expanded metal, angle iron $8 bucks old bed frames from the dump all totaling in at $1,000 to 1,200 if I do reverse flow or just tuning plates. I would already have this moving if it wasn't for my company giving me the whole month of December off thank god for my savings I had to build this cause I got to dip into those for all my bills, presents etc.