Bed Mod On A Classic 14RB

Would like to hear from anyone that has tried to mod the dinette. I was thinking of leaving the dinette down and using a memory foam mattress over the cushions but having it lengthways with the trailer so there would be no crawling over one another to use the restroom. Would like to know if anyone has done this and how they did it. The mattress would be turned back widthways after getting up but there would have to be a temporary support under the mattress between the fridge and sofa that could be removed. Inquiring minds would like to know. 

Thanks, Bob