Rofco Ovens Baking Space Height

Hi,

We are wanting to invest in an oven for baking at home. My current oven has only 6.9 inches between top of shelf and heating element. We are making sandwich loafs in  1lb  tins and they are almost touching the element , and if I put foil over them they both reduce oven spring and end up pushed against the element. I dread to think what would happen with a 2 lb tin. Trouble is we want to start supplying our church's homeless charity/street cafe with bread once or twice a week. We already bake for both ourselves, and parents, and sister's family. My daughter is interested in developing proper baking skills and starting a microbakery in a few years. She is home educated and we are baking everyday. 
So it makes sense to me to invest in a proper baking oven rather than a larger domestic oven, when the two we have are large enough for everyday cooking.

I was unsure whether to buy the B10 for now and upgrade to the B40 later . I am aware of the internal dimensions, width and depth, but cannot find the height of the baking spaces ( stone to heating element) . I have read that the B40 has taller decks and one person suggested that the others are only 6 " in height , is this correct as that seems awfully low. ? I would not be much better off than now if so.