My guess is about the same as the BB version at 135 gns. The exact weight isn’t that important but shouldn’t be less. We wouldn’t know for sure until Al has made up a final drawing.
As far as the base goes, who is interested in the GC vs PB vs BB?
For me, I would be happy with a PB or GC option. Post what style of base you would prefer and let’s get a consensus of a drawing so we can move this over to the group buy section.