The internal wall finishing-plastering price per sq meter seem to good to good to be true
Or the price u mention is only for labour only, not include material like cement, sand.....

so that is the labour's price only lor...

the painting price @ rm8/m2 for internal, rm12/m2 for external is like high rise project price already, just make sure the sub con give u quality paint.

another thing is the MDF skirting, imo is better to use those solid wood skirting like nyatoh, as the skirting will get wet when you mop the floor.