I actually think that if you made the top plate solid that would work for most of your actual end users. The shifters and cup holders could be cut wherever needed in that scenario. In fact, I would prefer to cut my own holes, as I am taller . There are so many variantions out there (manual, autos, stak, atlas, np205's) that you could drive yourself crazy trying to make them all fit. NP435 users proably could use it with the addition of a Gearbanger, but I agree that most buyers are proably the DD crowd with autos.
I'd buy one in a heartbeat, with a solid top.