I recommend you check in with a experienced modder, i am a terrible choice for making addons of that category, or any category of gmod addons for that matter.

make a simfphys version

I don't think there are many models pertaining to that particular subject. So far, the only model that was sent to Gmod was the Osório, and i was not able to get that to work.

There should be other sources where you could find models about these forgotten machines, but i'd hazard a guess it would be extremely difficult.

In the case of these replicas i've made in 2021, i had to use hundreds, if not, thousands of images to try and replicate every little shape they had to be as accurate as i could possibly be.

I am sure, however, that there are models of other vehicles out there, but they are not all that common.

i looked up brazils mbt once so i decided to look for models to make this tank off of but i cant find any so this is very sad