... fastenerStandard, LedgerStandard, Leger, DiagonalForce styleFriction, ShearAxial loadReliabilityFree frame node, diversity, low reliabilityFixed size component, steady structure ... , high safety.FlexibilitySize of frame is flexibleIn spite of limit by fixed size, ... .5T2.8TErection efficiency134Wastage rate10%5%2% ConclusionFlexible frame, low reliability, excessive material, huge wastage ...