To calculate the total cost of materials, can an ID+C project use the default of 45% of total cost of construction?  The v4.1 calculator has a separate 'Instructions' tab for BD+C projects (which includes the default method) and ID+C projects (which only has actual materials cost).  Does that mean ID+C projects do not have the option to use the default calculation method?  Or would they be able to determine 45% of construction costs outside of the calculator and just enter the result of the calculation? 

Thanks!