Reply by cracknpop

Alot of good advice above, including Jonah’s comments about ventilation for electronic components you plan to store inside cabinets.
Measure your components depth and make you sure you allow room for any connecting cables that will stick out the back of your components (receiver/DVD/etc). I built one with inside depth of 15” which was just barely enough. Your 20” cabinets and 12-15” shelves should work well.

-- Rick - I know I am not perfect, but I will keep pressing on toward the goal of becoming all I am called to be.