No, but you can't use this backplane or the backplane of the SCSI expansion.
This is also a mine problem, because I have another joy adapter and I want to install the 9 pin ports of joy in the space dedicated to the expansion door.
So the only solution is to make a custom backplane, for SCSI card and joy ports too (as the one you can see in this photo, I made it when I purchase my joy expansion)
And in prospective to have enough space I'll have to cut a little piece of backplane of the CDTV :roll: