Correct on those models, but you are overlooking the less expensive models that are the vast majority of DSLR's made by Nikon! Never heard of the D5000, D3000, D90, D60 or D40?
A. Sensors designed entirely by Sony or by Sony with input from Nikon:
D3X --- Sony sensor as in A900, A850
D300, D300s, D90, D5000 --- 12MP Sony EXMOR CMOS (possibly with some Nikon input, but I have not read that claimed by Nikon)
D3000, D60 --- 10MP Sony CCD (possibly with some Nikon input) as in Sony A230, A330, and various older models.
D40: 6MP CCD, designed by Sony with some Nikon input as far as I know, previously used in various Konica-Minolta and Pentax bodies and a lot of Nikon models.
[Earlier models D100, D70, D50: as for D40, while the D1, D1H and D1X used CCDs of Sony/Nikon designs, I believe.]
B. Sensor designed by Nikon alone
D3/D700 --- Nikon CMOS
[Earlier model D2H use a Nikon design neither CMOS nor CCD.]
Fairly clearly the vast majority of Nikon's current (and past) DSLR sales come from list A, using Sony or Sony/Nikon designs.
"but you are overlooking the less expensive models "
No. I said "I think the current cameras use basically the D300 sensor " which means the D300, the D90 and the D5000 and maybe others, I lose track. I thought that was so well known it was not worth writing it out in full.
Otherwise your information is incorrect, and without sources.
The D3x sensor is manufactured by Sony, but results from a collaboration between Nikon and Sony. You have no knowledge about who did what, unless you can cite sources, which I doubt.
The D300 and many other cameras (which you list) use a sensor manufactured by Sony, and designed by Sony and Nikon. That is well known, though no-one outside the design teams knows how much each partner contributed. You claim to know, but you do not cite sources. There are statements online that indicate that Nikon supplied key design skills. But quite what, I know not.
I have no idea about the D40 sensor.
Earlier professional Nikon digital cameras used Nikon designs. You forget that Nikon was one of the first companies to commercialise digital SLR cameras, until Canon overtook them for many years. It is quite possible that they lacked some key expertise which was later supplied by Sony. Again, we do not know. And nor do you.
I have no idea what each partner contributes, although Sony does the fabrication. The fact that Sony do not supply anyone else surely tells us a lot.
Regarding the idea that it is best to outsource design, the truth is that if you can design in house, you have more freedom, rather than having to rely on others. It means that you can invest on the long term and innovate based on your own needs. You don't have to wait until a third party produces something. If you look at the latest Leica M9 examples, ISO 1600 is awful. (I accept that the first images might not be representative.) The hard bit to get, and which differentiates is intellectual capital.