rust repair / bodywork- possible costs vs parts alone?

If a guy is looking at parts made by AMD, or equivalent reproduction pieces by another company, what might be a fair ratio/ multiplier to figure what a bodyshop would charge to install/ paint them.
I mean repair / replacement along the lines of rusted quarters, rocker areas, inner wheelhouses, hood hinge area, etc. Spots that are going to take welding and finishing skills.
Not "bolt-on" type pieces like valances/ hood/ decklid/ trim.

I know this is a very open ended question with lots of variables, so just hoping for a "rule of thumb # $$$".

I'm am considering getting a '72 E-body where i know the return value compared to investment will never be there should i need to sell in the future . It's a car that belongs to family/uncle, i cruised in it as a teen passenger decades ago, praticed in it for driving test, etc.
Essentially its the car that led me into owning probably 20 older mopars. But fuzzy warm feelings aside, i need to have an idea if the bodywork costs will crush the budget i could allot to it, or if i could afford to do anything else fun simultaneously with rehabbing the car. I am used to buying solid, basically no rust cars, so i want to be informed 1st.

72 Challenger needs, from my quick inspection, [ it is across the country ] no pictures sorry. Needs rear quarters/ maybe patch panels around rear wheels- swiss cheese, needs rockers-rusted, front fenders behind wheels- rusted, hood hinge area described as rusted, trunk area probable repacement needed also- described as "surface rust". Did not see in the engine compartment, so am unsure if the hood hinge area can rust without affecting the firewall or cowling {?}.
Did not get under car, car has sat in garages for last 15 years, so i think the suspension points/torsion bar areas are solid - but thats an assumption. Interior floors felt solid from the top, and no obvious water leaks into the car. OK, Thats all i've got, until i ask for specific pictures. Thanks.

Without seeing any pictures, if you want a shop to do the whole body, including paint, it sounds like something a reasonable shop will charge you 10-15K for, and specialty/high end shops will be charging you 30K+.

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If a guy is looking at parts made by AMD, or equivalent reproduction pieces by another company, what might be a fair ratio/ multiplier to figure what a bodyshop would charge to install/ paint them.
I mean repair / replacement along the lines of rusted quarters, rocker areas, inner wheelhouses, hood hinge area, etc. Spots that are going to take welding and finishing skills.
Not "bolt-on" type pieces like valances/ hood/ decklid/ trim.

I know this is a very open ended question with lots of variables, so just hoping for a "rule of thumb # $$$".

I'm am considering getting a '72 E-body where i know the return value compared to investment will never be there should i need to sell in the future . It's a car that belongs to family/uncle, i cruised in it as a teen passenger decades ago, praticed in it for driving test, etc.
Essentially its the car that led me into owning probably 20 older mopars. But fuzzy warm feelings aside, i need to have an idea if the bodywork costs will crush the budget i could allot to it, or if i could afford to do anything else fun simultaneously with rehabbing the car. I am used to buying solid, basically no rust cars, so i want to be informed 1st.

72 Challenger needs, from my quick inspection, [ it is across the country ] no pictures sorry. Needs rear quarters/ maybe patch panels around rear wheels- swiss cheese, needs rockers-rusted, front fenders behind wheels- rusted, hood hinge area described as rusted, trunk area probable repacement needed also- described as "surface rust". Did not see in the engine compartment, so am unsure if the hood hinge area can rust without affecting the firewall or cowling {?}.
Did not get under car, car has sat in garages for last 15 years, so i think the suspension points/torsion bar areas are solid - but thats an assumption. Interior floors felt solid from the top, and no obvious water leaks into the car. OK, Thats all i've got, until i ask for specific pictures. Thanks.

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This is a impossible question to answer, even with pictures none of us can tell anything for sure. But from your description, it needs every replacement panel made. Under hood is trashed if there's rust in the hood hinge area.

We all have opinions which are worthless in this case, but here's mine.
It sounds like it's only worth saving if you can do it yourself. Not many of us can afford to pay a shop to do that kind of rust repair and then plus paint. Paint alone is 10-15K if a shop does it for you today. imo

Good luck with the car.