Hey,

Based on what you wrote, I assume that your going for a 6 tub rack? If so 47.25" will work, but I would go with 48.00" or 4 feet.

I am pretty sure that you can find a couple of 4 foot melamine boards. it would save you a cut and give you some "wiggle" room.

When you put your rack together. Cut your top piece to size and attach your two sides.Then cut the remaining shelves. Now, Instead of attaching all the shelves at 7" intervals, I would lay down your first tub and place a shelf board on top of it. Secure this board and lay down the next tub followed by a shelf board. Secure this shelf board and continue like so. Constructing the shelves in this manner will insure a perfect fit.

Hope this helps.