I dont want to offend you, but I think your idea with the stainless steel fingerboard is not good for a number of reasons:
1. The notes will not sound frettet as Setch wrote
2. Why build a fretless guitar with the goal to make it sound like if it had frets?
3. The fingerboard will be very heavy
4. The neck will surely make trouble over time....metal and wood are simply too different materials
5. You will have a very hard time radiusing the fingerboard
6. I think it will be nearly impossible to set the action on this guitar in a way which eliminates buzzing
7. I dont think stainless steel will sound good at all. There are many people complaining about the sound of stainless steel frets and you are going to build a whole fingerboard from it?
8. Fretless Basses and guitars are built for their smooth, warm and singing sound. You will certainly eliminate this qualities with a metal fingerboard.
Please dont waste a nice 5A quilted maple top for such a project. If you really are convinced that this is a good idea, then try it with cheap parts first.
Greets,
MK!