well actually me and my freind took a dash of a 93 that was wrecked and tried to put it in the mkiii. after discussion and visiual aids we tried and we found that the dash on an mkiv is a little bit taller and wider hence the larger body of the mkiV but after integrating the supports and bars of the mkiii and removing some components from that of the mkiv we were able to put it in... lol but it was very sloppy and there were a couple of openings, of course considering that the dash is not going to be flush with the frame of the mkiii(the frame of an mkiv is more rounder than that of an mkiii) but i can imagine, with carfeull shaving, addition of mold (plastic,. etc)and remolding it can be done and it looks great. i mean we only saw a sloppy version( i eman the dash was held up my tape to the widsheild lol haha) but seing even that much made us happy, even the sloppy look of it looked nice.im shure that it would work and becuase the mkiii has a bit more room in the vehicle compared to that of an mkiv, those who were concerned about the whole cloesd space thing shouldnt have a problem if everything is up to par.
but thats only my input im just tryina help roy...
im kinda new to these boards so yah.