Now that you have thought of it, go out to your pile of bits, measure them up and work out these three critical distances.
1. The distance from rear of engine block to output shafts of transaxle.
2. The distance from output shaft to rear of your intended transaxle design.
3. The distance from the centerline of your input shaft to the centerline of your output shaft.
Now superimpose a drawing or template of this combination on your GT40 of choice & let me/us know how you got on. Good Luck.
One other thing for your consideration- Have you thought about the torsional load that you are going to impart to the donor transmission case when you mount your QC housing onto the rear of it. I am not saying it wont work, just trying to help-I'm good like that.
Jac Mac