jamb 72 of the doorway 12 of fig8 through the bamboo tubes having their ends in registry with each other in all of the eight walls entirely around the building and back to the door jamb 73 in fig8 one way of accomplishing this purpose is to provide smooth wires as at 74 in fig1 and thread one such wire through one of the bamboo tubes 33 where it registers with door jamb 72 and feed it in the direction of arrow 76 through the hole 77 in the door jamb and into the tube 33 in wall 11 when the wire begins to protrude from the edge of wall 11 it is then fed into the corresponding bamboo tube 33 of wall 13 and from wall 13 into the next wall and so on around the unit until the end becomes exposed at the door jamb 73 a winch such as 75 temporarily mounted to the door jamb 73 may have the end of the wire 74 connected to it whereby the winch can be used to pull the wire the same can be done for all of the other horizontal tubes in walls where a window opening interrupts the wall and the tubes therein the wires can nevertheless be used and extended from the window frame in that wall to the next window frame or door jamb in succession around the building and be winched and secured in the same manner as for.