Wow! You have me drooling in anticipation. Richard Ritter is currently working on the 7x17 back for my Franken ARCA. The bellows were shipped to him earlier this week from Camera Bellows in England for Richard to attach to the back he is making for me. Once that is done, and Richard ships the back/bellows to me, I'll have a little final assemby to do, but I hope to have the 7x17 Franken ARCA up in running in about 2 - 3 weeks.
Concerning the front rise, I"ll be able to get between 2 and 2 1/2" of direct front rise with my camera, but I also ordered one of the front standard "boosters" that will give me another 62mm of direct front rise. Since I'm new to 7x17, I don't know exactly how much front rise I will need, I may be able to get by with the built-in 2 - 2 1/2", but it will be nice to have the extender just in case I ocasionally need more.
Gosh, your camera looks nice! Please give us more specifics (min/max extension, weight, etc.). The precision geared movements on the rear standard have to be sweet. Due to the long focal length lenses used on 7x17, it will make the camera MUCH easier to use. I won't have any geared movements on the back of my camera (one concession I made to keep eth weight down), but I did opt to go with self-arresting geared rise and axis tilt on the front. That way I won't need a third arm to loupe the ground glass while applying tilts.
Congratulations on your new camera. In terms of usability and rigidity, it should blow away just about anything out there - certainly better than a wobbly old antique that would have probably cost you more money. What a great way to move into ULF.