Paying Contractors/Suppliers

Have been going around for the last few days with my cheque book paying the various suppliers and contractors, they are all up to date now so it allows me track the actual spend for each stage of the build. i have an A4 lever arch file going split into five sections and each section within that split into the different suppliers. I have section for

1. Upto floor level
2. Upto Wall Plate
3. Roof
4. External & Internal Completions
   
5. Finishes

Each section within these five have the suppliers and all there dockets at the front of each then are there invoiced costs and receipts of payments for each.