The analysis of the interior-equipment layouts of fore compartments of flying vehicles, where radio-electronic equipment is contained, is performed. It is revealed that structural layouts for the interior equipment of fore compartments of jet-fighters and guided missiles are completely analogous if the midship-section diameter is more than 0.5 m; if the diameter is from 0.2 to 0.5 m, the equipment arrangement is more tight in the missile; and with the diameter below 0.2 m, the interior-equipment structures of the missile present a single unit of onboard apparatus of large flying vehicles. It is shown that highly porous aluminum alloys or honeycomb structures made of aluminum alloys may be used as mechanical equivalents of interior-equipment structures for undersized models of flying vehicles.