Homemade DIY Acoustic Treatment Part 1: Building Reflector/Absorber Walls

I have been spending a lot of time over the last few months trying to get better at recording so when I track the next album I can get better sounds at the source.  I still believe I will have someone talented (like Mr. Jeff Hall) do all the mixing again, but I want to get better raw sounds for the engineers on the other side to work with.  I have been coming to the realization more and more that I need to do something about my awful recording room which happens to be a small square room in my apartment.  My main concerns were:

1) Tracking better vocals

2) Tracking cleaner electric guitar

3) Eliminating the room sound when I track acoustic instruments (mandolin, guitar, etc.)

4) Try to make the room have a flatter response when I attempted to do rough mixes for demo's.

Living in an apartment, I had two major constraints to work within: I needed something only semi-permanant and I did not want to spend too much money.  I have been putzing around the web for months to find some designs that other people had made.  I happened to find quite a bit, but ultimately decided on a custom design.  I wanted to have a frame that was 4' x 6' in case I ever wanted to use it to build a vocal booth (even though thats way down the road) and I figured they would be just big enough for any of the aforementioned applications.  With the help of my father (who am I kidding, he did basically all the work), we put together two frames over the weekend.  The frames consisted of 3/4 inch plywood, and 2x4" boards measuring 4' x 6' all the way around.  We used the excess plywood to make some simple stands for now.  All together now, I am about $90 deep in the project with about two hours of labor. 

I'll post up some pictures next week if we finish the project.  The hard part right now seems to be finding the correct insulation for these beasts...