If that is what you need, then fine. For me personally, the fewer strings that can get the job done, the better. 11 strings on one neck seems gigantic for most applications. Granted, there are guys out there that use 7, 8, 9 or more strings. But I think they are in a large minority to the number of people who are actually playing them.
My personal feeling on an 11 string, 36 fret fretless bass with a 36" scale is that it is going to weigh 12-15 pounds and it will be one beast to play in the lower register. I played a seven string Conklin and found reaching the B string and playing smoothly on it to require a lot of reaching. I probably couldn't physically play the bass your are suggesting.
Hey, if you can play it, and can fire up all the strings, I would love to hear you play. I will be sticking to 7 or less for the time being.
Geoff