What's heavy, and what's it weigh in light mode?
Not sure what it is right
now, but heavy was as high as 19lbs 4oz, I got it down to 18lbs 10oz, but with a few minor upgrades it should be down to almost 18 even. I think a lighter wheelset will be in order at some point. Envelope (e.g. Google docs spreadsheet) calculations with some super light parts could get it pretty low. We aren't talking UCI limits at all, but for a steel frame it's not bad at all.
I could probably "tune" a bit, I'm 152 at the moment and will be 148 come the start of the season, maybe lighter. Considering manufacturers (ENVE, Mavic, etc) target much heavier folks (ENVE targets 350... wtf) I think I could easily lose some unneeded material or go for much lighter components (like a dash seat/post combo).
Which is to say, it's roughly a 54 and should be in the low 18/mid-high 17 range which isn't bad at all. I think Mr Watson (Prolly) has a Bishop that's like 18 and change but he's a much bigger chap than I. There's some stainless bits that make it a little heavier and were probably unnecessary. As the builder is my buddy and this is like his 30th commissioned frame (so not too many) and the first of a more "racy/club riding" bent (he's done lot's of CX and some rather posh, flashy road bikes that are not light) I gave him a bit of carte blanche to try new ideas. The brake bridge and some other bits are stainless but with the tighter clearances he decided not to polish them up. (Needless to say I got a special deal for all that experimenting.)
A good many of my cat3 buddies give me shit for riding steel but I keep up fine.