Great post :) However, it looks like the "Table 5 - Gross Profit Summary (after electricity costs)" has a mistake.
The PC gross profit per hour is 0.0124, and it should be around 0.2976 per day (0.0124 * 24) , not 0.0216 as it is now.
This means that after this correction, PC becomes more lucrative than XU4.
RE: CPU Mining is back! A complete how to guide and profit analysis for Verium mining on a farm of single board computers - Part 1