looks pretty sweet to me! only thing I have heard (and this is just based of what i've heard) is that pulling out 41 qt tubs sideways can make them kind of unsturdy compared to pulling them out the long way. if you had room or if it was going in a corner, maybe make it so they could slide out the side but its a minor suggestion and this design should work just fine! Nice job.
That could be an interesting idea. It would turn it into an L-Shape unit.