I can't find that post either, but I think it was Randy who posted originally.
It is relatively easy to make a shelf. Since you've got the nose off, just measure or make a template out of cardboard or something. Trial fit it a few times to check your not interfering with anything. Material for final product is open; I tried sheet metal ( to put my XM antenna on...not as good as I hoped), but ended up using plexiglass obtained at the local builder's supply. Attachment is also open, but I've got 30K miles with heavy duty Velcro hoding mine on with no problems.
Best of luck, and since it is hidden, there are no style points involved!
Get busy livin' or get busy dyin'!
2003 BMW K1200LTC "El Gato Grande"
1993 Suzuki GSXR1100W
1978 Suzuki GS1000C 'Project'