Hello Steve,
I too have a Hauptwerk console based on an IKEA Galant table, and I plan to add a Behringer FCB 1010 to it soon.
At this stage I envisage building a separate structure to support it, and attaching this structure to the pedalboard. Forgive the verbal description, but at this stage it exists only in my mind so I can't send you any diagrams or photos.
My pedalboard is ex-Johannus (a spare AGO pedalboard which was sent out along with an organ where the client ordered a flat European pedalboard) which I acquired from the local Johannus dealer. It has magnets in the ends of the keys and I built my own magnetic reed switch key contacts to go with them, and MIDIfied it using an old Yamaha synth. It has worked nicely for some 12 years now in a number of different settings, most recently in my current Hauptwerk console. I added a board across the back of the pedalboard to conceal and protect the reed switches. This board is quite solid, and I plan to attach my envisaged swell pedal structure to it. The space between the back of the pedals and the wall should be enough to fit it all in.
I envisage making a wooden box with a sloping top. It won't need a front board since it will be attaching to the board already on the pedals. The angle of the slope will be the same as the angle required by AGO console specs for swell pedals. I have downloaded details of AGO console specs from the Wicks organ company website (
http://organ.wicks.com/). I plan to make the sloping top of the box almost the full width of the pedalboard with the view to possibly adding more pedals each side of the FCB 1010 at a later date (probably using electronic keyboard sustain pedals).
The top edge of the pedalboard thumping rail is flat and wide enough for me to attach a small wooden rail to it. The bottom edge of the FBC 1010 will rest here sitting behind the rail, which will hold it from sliding out onto the pedalboard itself. Once oriented laterally (again, following AGO specs for swell pedal placement) the FCB 1010 can then be kept in situ with heavy duty double-sided mounting tape beneath its feet.
As I say, this is all in theory at the moment, and I won't be doing the actual work for a while yet.
Hope this helps. Good luck with your project.
Andrew