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without going into too much details, i would suggest the following:
1. go for LWS
2. do up an option of using metal roof instead of recycling your existing roof tiles or epoxy painting over it
why?
your big ticket items are mainly the steel roof truss (RM14k) and supply and install of conc roof tiles (RM8k). RM22k/RM42k.
and plaster ceiling @ RM10k for just approx 1,900sf? that's about RM5.25psf!!!
negotiate for lower price of your plaster ceiling. that's a little absurd!
magic of metal deck roofing.
1. less joints as metal deck are large panel and if custom length, means no joint except at apex. less chance of leakages. less joints also mean no chance of thieves entering. do you know some roofing profiles does not even require any nailings? they use clips to interlock!
2. metal is lighter, hence, you would be able to re-space your LWS spacing to be much less. dependent on profile selected, you may be looking at truss spacing of up to 2m. battens can varies up to 1.2m instead. so expect your RM14k to be greatly reduced.
3. bigger roofing piece means less work. hence installation cost would also reduce. RM8k going down.
things to watch out for:
1. some people dont like the metal look
2. you need to add rockwool for thermal resistant and noise resistant
3. select profile to maximise your truss spacing and batten spacing. this would give you huge cost saving.
good luck!
1. it looks cheap
2. it's noisy as hell if it rains (even if you put 4" noise insulating layer)
3. did i mention it looks ugly?
but you got it all right. you're quite experienced i see. yes, you can save lots of money for materials since you use less materials for the trussess / purlins