Yup. It is a wierd idea. I like it! If you were a good fabricator, you could make a set of brackets to hold the 2nd trans in place just behind the 1st trans. A pair of yolks would connect them. The hard part would be connecting the (shortened) driveshaft to the rear end. It would need a u-joint on it for sure, maybe a yolk could be welded to the input shaft, it would have to be balanced I think. Depending on your skills this could be the part that shakes the project to pieces...