What is the equalization for design and build contracts?

Design and build contractors will include risk allowance with in tender sum and this should reflect completeness of design and residual risks it is prudent to include risk register in tender documents, clarifying which risks contractor is expected to take forward and which risk remains with client.This register can be used as  base for price risk allowance on this  can be analyze and normalized in similar fashion to work cost.Example, if tenderer has excluded a key risk that other tenderers have priced for then this should be addressed and either executed from all tenderers.( with clients agreement) or tenderer who has excluded it given a chance to include price for taking particularly risk.For overheads and profit contractors  should split their % rate to show amount for over head's and profit.

Any unreasonable low overheads and profit % can raise valid query about how contractor make profit on project.

please share your views.