After searching hundreds of models of USB charger, all of them looked like Altoids boxes.
Decided to design my own enclosure!
Step 1: Choose Your Schematic and Components.
Instructables have a hide range of usb charger models and schematics.
i used this one, just added a power jack for charging: https://www.instructables.com/id/Make-a-USB-iPhone-...
i've used recycled components from old electronic that had laying around.
Step 2: Measure Your Circuit
After defining your circuit, take all the dimensions and make a simple draw with shape and design you'l need.
Choose a 3d modelling software (ex. solid works, fusion 360, rhino, etc.) and start modelling.
remember to give some size tolerance for all the fixings and sliding of the different parts.
Step 3: Test Everything Once Again
This charger worked with an Ipod 4, Gopro camera , Samsung cellphones and a WiFi portable hard drive.
Hope you find this helpful.