Wish I knew but they did.
So the next big issue to tackle is the colour of the hull...the 'official' colour as stated by the Smithsonian restoration team is 'Benjamin Moore, Heather Grey', so I tried a test piece and it is very greeny grey and not how I remember it from my childhood in front of the tele. I read that the original creators knew that they were shooting TOS on Kodakchrome film which was known to have a blue-ish tint, so adjusted the paint accordingly. So if you paint your ship that colour and don't have that blue-ing filter on it. it will look too green and just plain wrong.