A few interesting DIY panorama head ideas

I wanted a cheap single-row pano head, so I searched DIY pano heads on the web.
Among many of DIY pano heads that I've found these were interesting.

Victor van Dijk's DIY pano head using stock Manfrotto parts.

• Panorama setup I
• Panorama setup II

Peter Reimer's DIY pano head that uses a ballhead mounted upside down.

• Spherical Panoramas :: Equipment

Erik Krause's DIY pano head that also uses upside down ballhead

• Pan/Tilt Panorama-Head

My Plan:

Upside down ballhead idea seemed great as it could be very inexpensive, if you already own a ballhead with separate pan lock, and the camera can be rotated around lens nodal point instead of orbiting around the center of the tripod. Yet you keep the convenience and stability of your ballhead.

Unfortunately I don't own a ballhead with separate pan lock.

I ended up ordering a panning base and Manfrotto sliding plate

The panning base will be placed on top of the ballhead, and the sliding plate will be mounted on the panning base to position the camera off-centered so that the lens' nodal point concided with the center of the panning base. Well, that's the plan.