This topic interests me also, though for different reasons. I believe that the chassis would benefit from welded steel reinforcements under the car, and the A, B, and C pillars need similar upgrades also. The EB II had this, of course, but if it were done to an EA, it would be possible to bring it up to even higher standards.
I don't see why it would be too expensive, but I'm just not sure who does that kind of thing.
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S