M113 bridge layer pics and info

I am working on a M113 Bridge layer , scratch build and it appears that all the info so far shows variations between the vehicles. No two are exactly the same in the bridge and lift assembly.
Does anyone have info on this please.
Images are ones Ive found so far.


Prototype :




thank you. I ve been looking more and it seems that the line drawing reflects the prototype.
I also believe that several modifications were made to these vehicles .
Most differences are subtle.

Here’s another view without the bridge :

You can notice the same flotation add-on parts as on the prototype


That is exactly what I was searching for.
Thank you so much.

Wow didn’t know that even existed! Very cool

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I have been working on one and there were a few details I was questioning.
My plan is to mold and cast it when its ready.