(apologies for the images to follow, you have all seen them too many times already)
I chopped my first B-2, which was a rickety road warrior, then completely rebuilt it custom. I carried that organ on the road for about 8 years.
It was a testbed for my chopping ideas, and for my first steps to learning electronics. Originally it was the "preamp in a box" style. Later when I built the custom case I put the preamp and tone generator in a box on the floor, and had a pianet built into the top. I had custom wiring harnesses going thru military multipin connectors.
The longer wiring harnesses added a little extra crosstalk and hash to the sound, but that was rock and roll, baby! I did not have any hum problems unless a ground wire broke loose somewhere.
http://www.hotrodmotm.com/images/gallery/ribbon2.jpg
Later I chopped off the pianet manual and put the generator back into the main cab, leaving the preamp on the floor. At one point I also had a cast off chorus generator in there.
The general experience ranged from fantastic (roadies did all the work!) to ouch (in the post-roadie era, once had to carry it up a 2 story external metal fire escape).
The organ itself was never attached to legs, and was transported on its back on a purpose built dolly which had super stout casters. 2 guys could lift it onto the stand. I would estimate the weight of that piece at about 200 lbs.
http://www.hotrodmotm.com/images/gallery/pile_of_keys.jpg
Later on, I did a radical rebuild of an already chopped B-3. This was my so called "modular organ" which broke down into top manual/preamp, lower manual, generator, and legs. Everything was built on aluminum subframes for an attempt at maximum weight reduction. I snugged the generator back up under the manuals this time in an attempt to minimize added crosstalk. All connections between sections are made with big 100 pin ELCO connectors.
This organ fit into the back of a Honda station wagon along with my regular keyboard rig (but no leslie). It was only gigged once or twice, and currently resides in a recording studio. I regard it as a failure in terms of a single person being able to move a Hammond anywhere (including stairs) because you still had a lot of heavy pieces, although the organ itself works fine.
http://www.hotrodmotm.com/images/gallery/hammond1.jpg
http://www.hotrodmotm.com/images/gallery/hammond2.jpg
http://www.hotrodmotm.com/images/gallery/hammond3.jpg
I regard Bob Schleicher's Oakland Chop to be the Cadillac of all the commercial chops that I have ever seen. Its slimline design is very elegant looking compared to the lumpy profiles of most other chops.
http://www.tonewheel.com/Graphics/Chops/d_simpson.jpg
http://www.tonewheel.com/Graphics/Chops/detail_internal.jpg