Can any one give me the demisions for the trans mount plate on a nv4500 in a 2000 dodge 2500 4x4 mainly the thickness so I can build one but keep every thing at the proper height 

I can't help unless you go by distance between back of valve cover and cowl. I think if you get that distance correct then engine angle and everything else should be ok. 4 and 1/2" from cover to metal behind rubber weather strip close to 4th valve cover bolt center of valve cover. Put a jack under tranny lift it to that distance, measure what you need for steel mount you're making allowing for some sag of mount.

Buy one, Rock Auto, $12.71, done.  

Its the plate that bolts to the trans tail housing then the mount bolts to that. I mainly need to know what the thickness of space it has  

So, you're looking for #1in the link below.

https://www.mymoparparts.com/oem-parts/mopar-transmission-mount-bracket-52019603ab?c=Zz1lbmdpbmUtbW91bnRpbmcmcz1lbmdpbmUtbW91bnRpbmcmbD0xMCZuPUFzc2VtYmxpZXMgUGFnZSZhPWRvZGdlJm89cmFtLTI1MDAmeT0yMDAxJnQ9YmFzZSZlPTUtOWwtbDYtZGllc2Vs

Yes. I need the measurements so I can biuld my own