see lol not even sure i should be answering your question in this guy's thread but since i wanna ask my own question i will: :-P

Depends on how big your bed is or the bit behind the closet. If tis like over 2-3 feet than I believe you should be aliright, if its smaller a few months ago i would have said you are screwed now Ill redirect you here:

http://www.dope-seeds.com/lowryder.htm

See its a samll plant about as big as my bed so i think it whould be alright under most beds.

NOW WHAT I WAS INTERESTED IN WAS:

I am doing somehtign simmilar myself but no shed just a grow box (self constructed) But also about 4 feet in height and about 3 feet stuck in earth (like dug a 2 feet hole put box in and dig around it make it coem up to 3 feet.)

What are the problems i am likeley to face??

See i have made a thread but no ones replied:
http://boards.cannabis.com/showthread.php?t=97680

THanks!

And good luck