I just thought I'd share an enclosure I made for a Raspberry Pi 3 with a Chord Mojo USB DAC running RuneAudio.
It contains the following parts, plus wiring:
Raspberry Pi 3 Mainboard
Tontec 3.5" Screen
5000 mAh Lithium Battery from eBay
Adafruit Powerboost 1000c
2 x Anker USB SD/MicroSD reader removed from plastic shell
2 x SD to Micro SD FPC Extender from Amazon
Up to 4 x PNY 512GB SD card(s) (2TB)
USB 2.0 Micro-B Male to Micro-AB Female Adapter, Black, Manhattan 308755 from Amazon
3D Print Enclosure made of nGen filament
It is 130 x 11 x 43 mm and weighs 540g.
The Tontec screen is resistive touch, and is very hard to use, so I added the USB Touchpad.
It works pretty well; occasionally I get some unexpected pauses--I don't know if it is because of faulty wiring to the SD Card readers or power overload. But it sounds great.