NDK DuCULoN: How it works? Possible to DIY?

[kinsei]

if you need it - ocxo basics

OCXO Application Notes - OCXOs - Oven Controlled Crystal Oscillators

 

[DF96]

That was talking about ovens (i.e. long term stability) rather than noise (short term stability).

I suggest you do some reading about oscillator theory and crystal filters. I remember reading a textbook on this some years ago but I cannot remember the title or author.