Wot a coincidence, I just moved into a 4S HDB Blk 130 Simei St 1 too, my reno is in Stages.
As I m doing the ID my self, My foundation has been settled, eg Hacking Wiring, Flooring Wall Plastering etc....
1. Hacking of Old Tiles Flooring, Kitchen, living rooms etc...
2. 2 Toilets Completed (Elevation Showerheads, Basin, toilet accessories, tiling, reroute of piping, copper to stainless steel etc..)
Next.... TV Console, Bedroom,Kitchen Cabinets etc....