using rebar instead BRC net steel for your floor is the best....but it is costly and timing cause, need worker to tie the individual rebar...
today tips:
1. attach picture below is my DIY for the kitchen sink pipe outlet. This is the correct way to install the kitchen sink outlet pipe. Please use this type of elbow (using screw) so that when your outlet pipe is blockage with food wastage , you can easily unscrew the elbow and clear the blockage with wire or 'wire ring' that you can buy from hardware shop.

     
2. From the pic below also, to avoid your food wastage pipe from blockage, use my tips, use at least upvc pipe size 3" or 4" at the last end to man hole, this way your do not have food wastage blockage is future. My design , from the sink, i use upvc sirim approve (thick) size 11/2 ", then goes to upvc pipe size 2", and at last goes under ground upvc pipe size 3" to man hole. Please study the pic in detail.

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want more clarification, inform me.
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3. For electrical, i would advise to have seperate DB for your house if you are doing reno, such as one DB at living room, one DB at kitchen or one DB at upstair. In this way you can easy manage and easy to troubleshoot in future.

4. If you are doing reno, i would advised you to install power socket and light inside your upper ceilling, And the ceilling power socket and light have switch control from down stair.
want more clarification, inform me.