actually, aside from the overall appearance of the tii engine bay, you'd be surprised what a day or two of scrubbing and vacuuming can do for these cars.
a Bavaria may be a good freeway cruiser, but i think you'd have a better chance of selling the tii off if you had to in the future. you might want to take a closer look at the steering box in one of those roundies. is that the hint of reddish-orange paint i see? could be a quick-ratio one, if so. part number ending in '177' will be the key.
the bavaria does appear from this distance to be closer to roadworthy than any of the others, though.
at the very least, they should be offered up as restoration projects, or donor pieces to save others. what a dilemna you have...
good luck to your father. you have more pressing issues right now.