yeah be very carefull buyin old cabbs, any damaged trim will cost you and is hard to source. for example outer door seals are around 90 each from the us, the plastic trims either side of the screen down a pillar are very rare and can go for upwards of £30 each

roof isnt an average DIY job either, it takes time, patience and fettling to get it right, plus it aint the time o year for it. If its a later cab and the filler neck has rotted they're over £100 from GSF and not the same as a regular tintop one either.
have a very good look underneath, particularly the inner arches and the inner sills, specially around where the rear beam bolts up. mine had nasty holes here I failed to spot which resulted in a 'cheap easy quick' project turning into a 3 year expensive nightmare!