Sketchup Change Dimensions After Drawing

I am somewhat new to sketchup - I have used it for just simple woodworking.

I have a problem with this model.

My research says this should be very easy.

I want to resize the short side from 1' 11 9/16 -to- 1' 11 1/4". I just want to shorten those six horizontal rods which are a little too long, not to scale anything else.

Every time I do this it resizes the long side and scales the model down.

Here is what I tried that does not work:

Use the tape tool, resize the short side
Group the entire model, Use the tape tool, resize the short side
Explode model to just a component, Use the tape tool, resize the short side
Explode the entire model, Use the tape tool, resize the short side

I could just redraw the model again in about an hour, but there must be a way to do this. Can you advise on a better way? enter image description here

EDIT1:

I tried to undo everything down to the basics.

I resized the vertical frame and saved a horizontal 2x4

I selected the long 2x4 and resized with the Tape tool to 13' 3 5/16".

Notice that the base of the vertical frame got resized from 1' 11 1/4" to 4' 1/2"

Am I making these componets incorrectly?
enter image description here

EDIT2:

I exploded the frame into two vert 2x4s and one horiz 2x4 because I noticed that when I modified the frame as a component OR the horizontal separately it would distort the 2x4's dimensions. I deleted everything else.

This time, when I modified the horiz 2x4 the dimensions of the vert 2x4 remained the same, but notice the horiz: It shrunk! The horiz is not 1.5 x 3.5 anymore.

So let me rephrase my original question: How do I tell Sketchup to modify my models overall dimensions >WITHOUT< changing the dimensions what the model is made from (namely 2x4s in this case).

enter image description here