Great thread! I have been looking for this. Just using 30% diff change is not realistic in the long run and probable not in this timeframe either.

Let me start with some easy ones:

Thash:         4200 Thash
Origin:              KnCMiner
Product:              Neptune Batch I (customers only)
Expected Delivery:   Until Q2
Scanario:              Realistic
Source:              https://www.kncminer.com/categories/miners
Reasoning:      Probable going to be shipping early Q2 (since they expect to ship all three batches before end of Q2. They have sold 1200 with a low estimate of 3Thash so let's assume they run at 3.5Thash. 1200*3.5 = 4200.

Thash:         4200 Thash
Origin:              KnCMiner
Product:              Neptune Batch I (new customers)
Expected Delivery:   Until Q2
Scanario:              Realistic
Source:              https://www.kncminer.com/categories/miners
Reasoning:      Same reasoning as above.

Thash:         4200 Thash
Origin:              KnCMiner
Product:              Neptune Batch II
Expected Delivery:   Until Q2
Scanario:              Realistic
Source:              https://www.kncminer.com/categories/miners
Reasoning:      Same reasoning as above plus I assume that they will eventually be sold out.