Structure beam Closing chain Top Plan & Side section

 Structure beam Closing chain Top Plan & Side section, ring of 10 X 35 cms. of No. 2 @ 10 in extremes and @ 15 in half cms.4 var. in 3/4 "ends, 4 var. of 1/2 " in extremes 2 var. 3/8 " in the middle etc.