As far as fabrication, ther was a bit to make it fit. First, the toy motor has a front sump oil pan, actually shorter than the a12, so you can position it lower in the chassis. Because the 5 speed tranny is larger than the Dat one this is a good thing. I had to modify the x-member for the mounts to fit right. The toy has different angles from lhs to rhs in regards to mount location. Not a biggie. I gave the tranny a bit more room by cutting out the tunnel and making up a slightly taller one with the shifter hole located farther back(about 2 inches). The biggest thing that had to be done was a fabricated hedder, because the Toy manifold was too large and wouldn't clear the steering box. You may not have any trouble with a rhd car though. I used the stock 1200 rad too.
Sorry for the long post. Any more specific Q's, just pm me.
-Donnie