Hmm... Cool. Nicely done. Very clean, and some room left over... (oh-oh... here it comes...)
Why don't you try to tuck a monitor switcher into there? And maybe write a quick program that can use it to switch the video input based on whether an Amiga screen or video card screen is currently the "front" screen.... That way the Amiga could integrate the Voodoo card screens into a more standardized output, much like other Amiga video cards do. ;-)