On my Tech V 23b, which may be slightly different in these details from a Tech 70, I can get 1-2mm left/right shift and about 7-8mm front rise.
For shift the bolts that the struts latch onto are the obstruction. For rise the post that supports the back and slides for rear movements in the upper left corner (viewed from the front) bumps up against the knob that loosens the front tilt on the front standard. With the standard fully recessed, the flap on top of the 23b doesn't come into play, so that would be the same on a Tech 70, but the size of the front tilt knob or the thickness of the sliding tubes supporting the rear standard could be slightly different, or there might be some other issue with, say, the screws for the accessory shoe that could get in the way.
The only case in which you would need to use the camera that way would be if you were trying to use a 47mm or 45mm lens. I've tried a 47/8 Super Angulon, and it's a bit of a pain, because you have to focus by sliding the standard on the inside track, which is a bit imprecise, but at least it has lots of DOF relatively for the format, so you can set the focus at a fixed distance and change the aperture for more or less DOF.