I am planning to build a master closet organizer for a walk in closet.
I am basically building big boxes as follows:
using 3/4 oak furniture grade plywood for the tall sides and shelves
and tops
they are 15" deep
there will be bascially 4 boxes of the following sizes
1) 50" wide X 81" tall x 14" deep
2) 61"w x 81" h x 14"d
3) 36"w x 84"h x 14"d
4) 48"w x 84"h x 14"d

the first 2 will be along one wall separated by a 3 ft door
#1 is for long clothes
#2 is double hang with a shelf in the middle

#3 and 4 will be joined together next to each other
#3 is for long clothes
#4 is double hang with shelf in middle

for each box I will have a brace near the top and bottom so that I can
attach the box to the wall. the side panels will screw into the braces
(i am assuming the braces should be solid wood)

| |
|==========| brace
| |
| |
| |
|==========| brace


How do I attach the top shelf to the side panels? Using screws into the
edge of the plywood is not a good idea. I could use a corner brace?

How do I make the bottom front rigid enough with out putting in a "toe
kick" board or will it be ok without one esp on the boxes that have a
middle shelf.

What is the widest I can go for the boxes before I have to worry about
sagging in the pole and etc. I can add a middle brace to the pole to
help support the weight?

the top shelf will not have anything heavy on it--maybe just sweater
bags--do I need to worry about the shelf sagging in the middle.

I have looked at all the closet organizers and etc and they all look
cheap and not all that strong looking and expensive. I have made a
closet organizer for a small closet and now am expanding but this is
different.

Any suggestions would be appreciated. Thanks.