@Abdullateefade1 As one of my Oga will say, details is what you imagine it to be, how your elements come together. It is likely if you go through Google scholar and other website where you seek journal, someone may have written about this but we lack practicality in Nigeria.
@Abdullateefade1 In movies, we'll see people chasing themselves over the roof and we all say it's film trick. I hope you see the number of people standing on that roof. Also, they construct their roofs to stand the weight of snow and even at that, they still do roof raking from time to time.
As a contractor, when you receive an unpriced Bill of Quantities BOQ for pricing and subsequent bidding, these 3 things are a must to do before you submit;
1. Visit the site physically.
2. Request for the design documents and confirm the quantities.
3. Thoroughly review the BoQ.
@Abdullateefade1 You hold the right to advise him. You can do a comparative design, then explain what you've done better to improve the design you're expected to replicate.