This will create all the belts. And the Requester chests are there so when you upgrade your belts they will all be converted to the best ones before new ones are build.
The basis of this print is here https://factorioprints.com/view/-KYpTULTDIvDOsJfgjeS
But in the current version of the game it does not work, so I updated and slightly improved it.
4.4.2019 update. Red circuits now on belt instead of the request chest