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Willy,
I have the car apart right now, so I cannot provide the distance down to the frame, which probably would not be right anyways as I have a top loader and you have a T5.
My engine and transmission are parallel to the frame tubes and the tail of the transmission is about an 1" higher than the pinion on the differential, which is a salisbury type. I had to custom make my transmission mount and would suggest that you allow for some adjustment in the mount for side-to-side adjustment and I also use longer bolts and washers as spacers to manage the vertical adjustment so that the drivetrain is set up correctly. Probably will not ge back to putting things together until the weather warms up a little.
You are making nice progress.
Jim
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