Militia Engineer Tasks- Hay Bale Shelter/Hiding Place

In this video I give a possible hiding place and survival shelter for winter. Using stacks of straw or hale bales as the walls and insulation for concealed space or room. This would more easily be constructed in fall as farmers are bringing in hay for the winter. At that time it would be easier to construct and conceal. The size would depend on the abilities of the people constructing it, the materials available, and the location where it would be constructed. A concealed entrance should be constructed that would not be easily found during searches by counter-insurgent forces. Ventilation should be planned for for prevent asphyxiation. This could be done using 2 PVC pipes and some wire screening (to prevent easy access by rodents). Comments and suggestion from people that have tried something like this or seen similar (like in Northern Ireland) would be appreciated.