Step 1: First, build a default-jwm .iso with this command...

sudo ISO=jwm install-nutyx

Step 2: After it finishes building the basic .iso, if you want to customize it, enter chroot with this command...

sudo install-nutyx -ec

Step 3: Add the packages needed for your customization...

sudo cards install xdgmenumaker dmenu oxy-cursors deepin-gtk-theme \
pavucontrol picom ttf-liberation yad lxde-appearance \
papirus-icon-theme pcmanfm leafpad volumeicon cbatticon \
xfce4-notifyd conky nitrogen fonts-ubuntu \
alsa-utils lxde-randr gtk-engines murrine \

Step 4: Move files, scripts, etc. into designated folders...

Open the file manager as root, go to /mnt/hd/, and copy following files/folders from your system into the corresponding folders.

4.1 Copy the following from your files/folders into /mnt/hd/ folders... :

/root/.gtkrc-2.0
/usr/share/images
/etc/fonts/local.conf
/etc/.bashrc

4.2 Copy these files/folders from the HOME folder into /mnt/hd/etc/skel/ :

.conkyrc
.gtkrc-2.0
.jwmrc
.Xresources
.bashrc

4.3 Copy these files/folders from ~/.config/ into /mnt/hd/etc/skel/.config/ :

conky 
glib-2.0
gtk-2.0
gtk-3.0
jwm
libfm
nitrogen
pcmanfm
volumeicon
xfce4
picom.conf

Step 5: You're ready generate an new jwm ISO

sudo ISO=jwm generate-nutyx