Just curious about a two door conversion.

[Bowman9]

How much money do you think it would cost to convert a panther car from four doors to two doors?

I was thinking you would need two cars, the second would be a parts donor.
You would cut out the door post from the donor car and weld them into the good car (with it's original post still intact to keep the body stiff and straight) after the new post have been braced in the old post could be removed.
The front doors would need to be lengthened, the old rear door area would need to be skinned.
New glass would be need to be cut for the longer doors and new porthole area.
The interior would need new door panels and new rear panels.
The front seats would now need a forward tilt feature so passangers could get into the rear seats.
New door rubber would need to be fabracated.

Lets go out and by two used crown vics and get started. :)

[MarauderMark]

Or you could buy this and let the nightmare begin. :D
http://www.acclassiccars.com/Borgota/vehicles/2002Mercury.jpg

[Warpath]

You wouldn't need donor posts. You could just use square tube stock to stiffen/strenthen the body. I would think you should get donor doors though to use to lengthen the OE doors. I've seen some people make panel vans out of PT Cruizers by just welding the rear doors shut. It may be possible to cut the rear doors and weld what is left in. Just some thought of how I would try it. I'm not that skilled.