1. Bottom width of the rack (front to back) 19.5"
2. Height (bottom to top) 29.5"
3. Top width of the rack (front to back) 16.75"
4. From the bottom dimension make a point 3" above that point for the kick plate (this is the point at which that rack will begin to slant
5. Draw a line between the top of the kick plate (3") dimension and the end of the top width of the rack dimension
6. If the edges of your piece of wood is straight (generally they are, or close enough for this) then you can use it as a reference and you will not need to make additional cuts.
7. Your ready to cut the side pieces of the rack. If you have access to a table saw this will yield more precise cuts and the overall rack will look nicer and fit together better, if not, any saw will probably suffice. This rack was done with a battery powered skill saw and it turned out great.
8. If you don't have a table saw try to clamp a straight edge parallel to the line to be cut. Make sure to set the parallel piece an equal distance from the blade so that you are still cutting on the line you made.
9. Start with either the top or bottom cuts and end with the angled cut.
10. Once every thing is cut and you have one side of the rack, simply trace that piece on to the remaining piece of wood (for symmetry reasons, as well as if you made a mistake at least it will be consistent) and repeat the cutting process.