This is a beautiful colour, also known as Off-white
As for button-down collars, the points should be long enough to give you whats referred to as a roll. Unlike a roll in a jacket collar, a shirt collar roll is a good thing and it can only be achieved with points long enough to give you such a roll
Thinner or Thicker - For a thinner consistency, stir in more lemon juice (or water), one teaspoon at a time
Learn how to do this with my invisible finish/join tutorial
If youd prefer to save a few bucks or skip the glue ups, Id suggest using cabinet grade plywood (oak, birch, or maple) instead
Pro tip: For best results, iron and steam the shirt while damp to make your shirt wrinkle-free