Hi i thought this might be some usefull to you in some way, a little while ago i had an engine conversion on my fiesta they guys who carried it out had a 4x4 2001 fiesta, i recall them saying they used a mitsubishi evo 4 running gear which fitted a lot easier than the other methods they considered. The tunnel / housing they just cut and welded in metal panels through the spaceframe instead of finding a donar.