It should be pretty simple to get someone who knows how to use a soldering iron to make up a splitter loom, but the (slightly) more difficult bit would be get a 5VDC power supply capable of supplying sufficient current for all of the devices.
For the power supply add up the wattage rating on each of the warts and get a power supply that meets or, preferably, exceeds that total by at least 15% (so it doesn't run too hot). Also have some sort of mounting, so it is not sitting on the carpet, etc.
For the loom ensure that the cable is figure-8 style power cable, not axial style signal cable - they have very different load carrying capabilities. Probably best to protect the common joins in a small box with strain reliefs (e.g. cable ties).