You can use the same wood you currently have, you will just need to get some 2x2's and 1x4's to design things differently. I had mine setup bookshelf style and had to change it due to warping
The design in this link helps a ton with warping
http://www.blueappleherps.com/page13/page14/page14.html

The only thing I changed is I use an additional 1x4 in between the two on each side, so I have 3 legs each side for a total of 6 legs... Also in the directions he used plastic shelving but melemine will work also..