Thank you everybody for the kind comments.

The glamour shots of the camera aren't misleading, some of the functionality however isn't where I'd like it to be.
Aluminum has the worst friction coefficient and has therefore turned the travel of the rear standard stabilizer-nut, into a not-so-smooth operation (even with the addition of Teflon washers) ...conversely, the movement of the front standard carriage is so smooth (the lead screw is virtually resistance free yet without slack) that, depending on the extension and pull of the bellows, it's hard to keep the carriage in place (can be corrected with proper placement of the bellow support)...AND of course the sagging bellow ...and ...