I use my SK1 for more than one year and I am very happy using it so far. Since this thread was very useful for a lot of questions that I had in this time I thought I also could share 2 tricks that I have done with my SK1.
One trick I have done to my SK1 last week was, to take a Doepfer D3m (which has the same Fatar TP08 waterfall keyboard and same width as the SK1) and build wooden endcaps in order to achieve an easy to build and inexpensive SK2/C2D/C2 alternative. I purchased both keyboards in good used condition and in retrospect the price margin is quite remarkable. The Doepfer comes without endcaps and has a very similar screw system as the Hammond. I drilled the holes according to both keyboards into self built wooden endcaps, sanded everything down and finished it with beige (aerosol spray RAL 1015) and then screwed everything together. I added a bottom panel (below the SK1) and a moveable back panel and this way got room for the storage of wires and accessories. In total I used 18 removable screws and 4 pieces of wood. I am very satisfied with the performance of the setup, the Doepfer has an integrated midi merge function, therefore I can plug my bass pedals via midi into the Doepfer and the Doefper's midi out into the SK1. Everything works without any midi problems!
The other tip I have, is to use the Ocean Beach DB-1 Midi Drawbar Controller for the SK1/2. This way one can control both manuals with real drawbars. You can program it very easily (Dave from Ocean Beach helped me a lot and is very quick with answering questions) with the downloadable Configurator program. One can assign either the lower or the upper manual (or the pedal) to the DB-1. When I use it, I place it in the middle (the DB-1 has small rubber feet which are exactly as high as the SK-1's buttons, this way nothing will be pressed and it fitts perfectly in the middle. I do not need the display anymore since now both drawbar sets are displayed physically. The only flaw is, that this way one will not be able to use the Preset-Buttons. Sadly the DB-1 does not fit anywhere else on the SK1. I will soon have to build something to solve this issue... Also the DB-1 has an integrated midi-merge function which works perfectly without any midi problems.
I have a question to all these who own a Hammond SK2/ Nord C1/C2/C2d softcase: Can someone please post the inner measurements of one of these softcases? I would like to know if my "new" organ fits into one of them...
Here are some pictures: