@Chris:
Only now I had the time to look up most of my changes on my Flubox, i'll leave the instructions here, for you, or anyone interested (maybe myself, when I need to reinstall :-))
Quick Personalization of Fluxbox:
Fluxbox on antiX does not come, out of the box with a graphical way to make changes, so you have to use the C.C. ( Menu - Control Center - Desktops - Edit FluxBox). This opens up the text editor with several tabs, each referring to the relevant parts of the configuration Menu, Keys, etc.
It looks strange if you used to the, now almost standard, way of graphically editing your options, but it's not that hard to master the way this works...
[Note: to apply instantly any of the text file changes to Fluxbox mentioned here use the Menu - exit - restart session]
1- Adding your favorite applications to the start of the menu:
I start with the hardest thing on the list

... It's a easy thing thing to understand, once you get the hang of it.
If you want to know where the programs you installed are, open your file manager and navigate to "usr/share/applications" and get an idea how to start the desired program... The icons usually at "usr/share/icons".
If you manually installed any app (like I did with Firefox Quantum (see below, I installed it in my home folder), it's easy to know the application and icon folders location...
You have to edit the "Menu" text file.
In the line after [begin] add the application you want using this formula:
[exec] (Name_of_the_Application) {command_need_to_run_the_application} <path_to_the_icon_in_png_format>
Note: make a backup of the changes you make to the "Menu" file, they may get undone if the menu changes (ex: after you install an application)... there's away around that, I believe, but I'm too lazy to look for it. If the menu changes, I just paste my changes back in the start of the file...
In my case, the start of the Menu file looks like this:
[begin] (PPC)
[exec] (Terminal) {desktop-defaults-run -t} </usr/share/icons/Faenza-Cupertino-mini/apps/32/terminal.png>
[exec] (My Computer) {spacefm} </usr/share/icons/Faenza-Cupertino-mini/apps/32/file-manager.png>
[exec] (Firefox Quantum) {/home/PPC/firefox-61.0b14/firefox/firefox} </home/PPC/firefox-61.0b14/firefox/browser/chrome/icons/default/default32.png>
[exec] (Google Chrome) {/usr/bin/google-chrome} <//usr/share/icons/hicolor/32x32/apps/google-chrome.png>
[exec] (LibreOffice Writer) {libreoffice --writer --nologo} </usr/share/icons/Faenza-Cupertino-mini/apps/32/text-editor.png>
...
2- Add a "Start menu" to the bar:
Remeber it show as a arrow, not an icon, on the default Fluxbox that comes in antiX,
On the "init" text file look for the line with "session.screen0.toolbar.tools:" and edit it, adding "RootMenu" to it's start.
In my case, my "session.screen0.toolbar.tools:" line reads like this:
session.screen0.toolbar.tools: RootMenu, iconbar, systemtray, clock
3- To add Windows and PrintScreen Keys:
On the "Keys" text file add, anywhere:
Super_L : RootMenu #call the menu when you press the Windows/Super key)
Print :Exec antixscreenshot.sh # Take a screenshot
4- Configuring the bar to auto-hide and be full size:
This is the only configuration done via a graphical way:
Right click the bar, on a empty space and activate "Auto-hide" (nice option to activate in case you are using a small screen) and set "Dimension" as 100%.
Most of this changes will make Fluxbox look and fell more like a "regular" DE, without adding any weight to it...
P.