Hello! Sorry for this long delay, but hey, better "later" than "ever".
I finally shared the LittleJet! "desktop version", and you can download it from here: https://www.prusaprinters.org/prints/110700-littlejet-desktop-speakers

The BOM is:

• x2 - Peerless by Tymphany TC6FD00-04 2" Full Range Woofer
• x2 - RCA panel jack
• x2 - Inductance 1.05mH or close value
• x2 - Resistor 3.7Ohm or 4Ohm (from 3W are good enough)
• DC panel plug
• This amplifier module here (non-affiliated link)
• 19v - 4A Power supply
• Stuffing material (polyester material)
• 3D print all the files once

HOW TO BUILD VIDEO: