It has taken me 10 hour days, each day, for the last two years, just focused on this single project alone. As Albert has indicated, we will continue to offer whole new, unique Mustang experiences, just as this first product has - each being individually desirable in their own right. They are not 'just additional repaints' - as I have indicated before, but completely different aircraft throughout, as already shown in Part 1.
Over the next 1-2 months, I will be puting together a definitive paintkit, to cover all of the D-model products, and this will be no easy task, with hundreds of layers to go through in each variant template. Besides this, many people will request to have spec map templates, and bump map templates besides, as these too are different for each and every model!! When finished, it will be released when the right time comes to do so. This has been the plan from the get-go, I just didn't know it had to be stated. It is very nice to see enthusiasm over creating additional repaints, I just hope that patience can last until the paintkit is released - the paintkit will not be product independent, as it will be for all.
As many know, a paintkit for the P-51B/C has been available upon request, nearly since the time the aircraft was released. (Skyhawk, I also clearly remember sending you one, upon your own request - if you still desire to have it, please contact me again). The paintkits for the D-models will be no-where near as simple to put together.
Of special note, "P-51D Restored Part 1" features 3 completely different prop blade types. Amazingly, covering the variants in Part 2, there will have to be 2 more completely new prop blade types! Details like these, which you will continue to find, have never been covered before for flightsim.