got some first hand paint experiance no way am i a body man tho
paint jobs are all in the prep. i can see how he is offering the paint job ( just spraying the car) for free
you will be in charge of the hours and hours of sanding , dissasembling and masking. which is the worst part of painting.
I do agree that you should paint it tho. ive done budget tremclad paint jobs before. from rolling to spraying ( in a professional air gun)
and it comes out decent. hell my current car is touched up with just black rattle can and a good clear and people cant even tell.
i say you practice on a fender and do it piece by piece just find a colour thats close to what the jambs are like , spray it/roll it and rock it