Posting pics of your stand with the doors closed and open will help to advise you on the best method of modifying it. Don't be cutting anything before adding replacement support or structure.
Its just a cheapo 3/4" particle board cabinet that you would find at petsmart/Petco with 3 doors. I just looked inside and there's no real frame work. Its kinda scary if I think about it, knowing that compressed sawdust is hold up 1000+ pounds.
I'll still try to get a picture or 2 but I think I would have to do some 2x4 framing before I even think of cutting.