Here is a good program for DIY'ers

So i use this a lot and it seems to work out any bugs I may encounter during my build. Which saves me money and time.
Just click on the big blue button thingy on the right and its free. Plus you can import or export your designs or others designs. Happy drawing. I have a blast playing with this thing when im .

http://sketchup.google.com/download/

Oh yeah use the tutorial the first time. It helps a lot.

And I'll try to post a finished result of a cab i am designing tonight.

they have modules you can add in like flood tables, grow lights, etc. it's pretty cool I can vouch for that.

yeah and for some one that does not want to start from scratch you can download other peoples grow box's closets and stuff.