Hi radams,
KTT Enterprises is owned by Frank Coffey who is the son of one of the founders of Latex International so he is very experienced and knowledgeable and has been in the business for a long time. A forum search on KTT (you can just click this) will bring up more feedback about them. They are also one of the suppliers included in the DIY component post #4 here.
The type of latex you are planning to use as well as the cover would make a difference as well as whether your total cost includes a foundation. Some of the online manufacturers that are members of this site that sell component latex mattresses (see post #21 here) are less than your $2000 total for King size and you would have the ability to exchange layers at little cost so I would make some careful value comparisons before you spent $2000 on a complete DIY mattress.
Phoenix