Thanks FYI - It was discovered when my terminals did not start up automatically under fluxbox.
Got some useful replies....the kind I have been looking for. Thanks. I will be tinkering with your suggestions and see what I find....and will definitely share my findings.
If I type these two commands in a terminal:
xfce4-terminal --hide-menubar --hide-borders --hide-toolbars --title=dt
wmctrl -r dt -e 0,10,10,720,720
I get the desired result (position and resize of window with title dt, noting than unlike gnome-terminal, xfce4-terminal doesn't rewrite manually assigned titles)
Naturally I would expect this to work: