AFAIK, Cordia is effort aimed @ bringing Hildon UI to Meego core - so, developing Cordia is (almost?) same, no matter if for N900 or CordiaTAB. Meego core is same, right? With working hildon desktop on Meego (aka Cordia Job Done ), You can use it both on CordiaTAB and N900.

Feel free to correct me, if I'm wrong, obviously.