It seems like MCS had proposed purlin ZC20015 during your meeting with them on 22nd Feb. What is the benefit? Faster fabrication? Zaw Zaw Aung and I am not aware of this proposal.
Thananan mentioned GL. 6 need rafter if use purlin Z. Do you mean another rafter in addition to the original rafters? Or does he mean we can get rid of the original rafters except at GL. 6?
Anyway, as our confirmation was late, MCS responded they will follow structure drawing S06.5. Please confirm if we have no more outstanding issue on these.