General notes and schematic drawing of shelters.         All tools necessary can be included in the container       (screwdrivers, wrenches, stepladder).       Electric drills make assembly even easier and faster.         Electrical supply may be provided from common external source or smaller       wattage "internal" sources such as 12-volt batteries, solar panels       and wind-generated accessories.         All models are leak proof and provide excellent protection against moisture.       Custom designed collapsible flooring is also available, further insuring       a waterproof environment.