Update 2020-09-07, 64-bit ISO now with UEFI support Many thanks to @jamesbond from the Puppy Linux forum

BusterDog, based on the Debian 'Buster' branch but without systemd.
It's using special method (taken from AntiX) to avoid systemd by replacing systemd with 'elogind'.
(and more, e.g. libsystemd replaced by libelogind)
Forum thread
See Here for a Busterdog build system.

(see specifications below)
Iso 32 bit: BusterDog-openbox_jwm-2020-06-29_32-bit.iso Size: 302MB Md5sum
Update 2020-09-07, 64-bit ISO now with UEFI support
Iso 64 bit: BusterDog-openbox_jwm-2020-09-07_64-bit-UEFI.iso Size: 345MB Md5sum

DEVX and Firmware squashfs modules: Here

Built from scratch by using debootstrap and remastered afterwards.

Custom repository: 32-bit 64-bit

root with password root
puppy with password puppy

Specifications:
Kernel 64-bit version: 4.19.0-10 (the kernel is separate module)
Kernel 32-bit version: 4.19.0-09 (the kernel is separate module)
Choice of Boot Methods: porteus-boot and live-boot v3 (see for options Here)

Default WM - OpenBox, with Desktop choices (run 'Desktop Manager' to choose):

• Tint2 panels
• PcmanFM providing the Desktop and lxpanel
• Tint2 bottom panel and rox-pinboard providing the Desktop
• Xlunch, graphical application launcher

Option to switch to JWM window-manager
Default File Manager - PcmanFM with option to use rox.
Default Internet Browser - Palemoon.

Screenshots:

Openbox with tint2 panels:

Openbox with PcmanFM and lxpanel: