Hi Don
Thanks Don!
I just cut slots in a strip of walnut, but I broke some along the short
grain, hence the dowels.
The best spacing I found was 1 ⅛” for most (except for the larger handles I
made which needed 1 1/4” spacing).
The easiest way I found to do this was to space out the holes I wanted, and
then to FIRST place some dowels into the board for reinforcement, then
plane everything down nice, then to drill the holes and cut the slots etc.
    I found that this allowed the tools to sit and not fall out of the slot
as I moved the hinged frames or door panels.
The saw slots alone didn’t work very well, since things tended to tip
over.  A 3/8” deep forstner hole (ie flat bottomed) provided some nice
support so the ferrules could sit into the board and not tip over or fall
out.  On some I drilled right through the board (to fit the entire ferrule,
ie a through hole) and just cut a slot through the middle.  Slots are
better than holes; Easy tool removal this way—. I could lift the tool a
half inch or so, and pull the tool straight out.  I didn’t want closed
holes that require a ton of space to pull the tool straight up.

 As far as the cabinet is concerned, I don’t remember, but I probably
copied it from a photo.
  The tool hanging ideas I have come up on my own but the angled hanging
screwdrivers came from Studley chest.  I am also using magnets to hold some
of the things in place.
Cheers
Claudio